Guide to Dried Chillies: Types, Heat Levels, and UK Substitutes

The Complete UK Guide to Dried Mexican Chillies

Dried chillies are the soul of Mexican cooking. They provide not just heat but complex, layered flavours - smoky, fruity, earthy, sweet, and bitter notes that transform simple dishes into something extraordinary. Understanding dried chillies is the single most important step you can take to improve your Mexican cooking in the UK. This guide covers every major variety, their heat levels, flavour profiles, where to buy them in Britain, and what to use when you can't find the one you need.

Understanding the Scoville Scale

The Scoville Heat Unit (SHU) scale measures chilli heat. For reference, a standard bell pepper is 0 SHU, Tabasco sauce is around 2,500-5,000 SHU, and a Scotch bonnet (easily found in UK supermarkets) is 100,000-350,000 SHU. Most dried Mexican chillies used in everyday cooking fall in the mild to moderate range of 1,000-30,000 SHU - far less frightening than many people expect. The flavour, not the heat, is the point.

Essential Dried Chillies for UK Cooks

Ancho Chilli (1,000-2,000 SHU) - Mild

The ancho is a dried poblano pepper and is the most commonly used dried chilli in Mexican cooking. It has a sweet, fruity flavour with notes of raisins, prunes, and a hint of chocolate. Anchos are the backbone of mole poblano, enchilada sauce, and countless other dishes. They're large, dark reddish-brown, and wrinkled, with a wide flat shape. In the UK, anchos are available from Cool Chile Co (£4-5 per 50g), MexGrocer, Amazon UK, and Sous Chef. They're an excellent first dried chilli to experiment with because their flavour is deep and complex but their heat is very gentle.

Guajillo Chilli (2,500-5,000 SHU) - Mild to Medium

The guajillo is the second most popular dried chilli in Mexico. It's long, smooth-skinned, and deep burgundy-red. The flavour is tangy and slightly sweet with berry and tea-like notes. Guajillos are the go-to chilli for red enchilada sauce, birria, and many everyday salsas. Combined with ancho, it creates the classic flavour profile of Mexican red sauces. Available from the same UK online specialists as anchos, typically at similar prices. If you buy just two dried chillies, make them ancho and guajillo.

Chipotle Chilli (5,000-10,000 SHU) - Medium

Chipotles are smoke-dried jalapeño peppers, and they're probably the most well-known Mexican chilli in the UK. The smoky, rich flavour is deeply addictive and works brilliantly in marinades, salsas, soups, and even chocolate desserts. In the UK, chipotles are the easiest dried Mexican chilli to find. Whole dried chipotles are available from specialist shops, but chipotle paste (Gran Luchito brand) is stocked in Tesco, Sainsbury's, Waitrose, and most other supermarkets for around £2.50. Chipotles in adobo sauce (tinned) are available from MexGrocer and Amazon UK and are incredibly versatile.

Pasilla Chilli (1,000-2,500 SHU) - Mild

The pasilla (also called chile negro) is long, thin, and very dark - almost black. Its flavour is complex: earthy, herby, with cocoa and berry notes. It's a key ingredient in mole negro and is often used alongside ancho and guajillo in the famous "holy trinity" of Mexican dried chillies. Finding pasilla in the UK requires specialist shops - Cool Chile Co, MexGrocer, or Sous Chef are your best options at around £4-5 per packet.

Chile de Árbol (15,000-30,000 SHU) - Hot

These are small, thin, bright red chillies with a sharp, clean heat and slightly nutty flavour. They're used in table salsas, chilli oil, and as a garnish. Chile de árbol is the Mexican equivalent of reaching for chilli flakes - it adds straightforward heat without too much flavour complication. Available from specialist UK shops. In a pinch, dried bird's eye chillies from Asian grocery shops make a reasonable substitute.

Habanero (100,000-350,000 SHU) - Very Hot

Dried habaneros bring intense, fruity heat to Yucatecan dishes. Fresh habaneros are actually quite easy to find in UK supermarkets - Tesco, Sainsbury's, and Waitrose all stock Scotch bonnets, which are closely related and make an excellent substitute. For dried habanero, check specialist shops or simply dry your own fresh ones in a low oven (80°C for 6-8 hours).

Cascabel (1,500-2,500 SHU) - Mild

Round, dark brown, and named for the rattling sound their seeds make (cascabel means "rattle bell"), these chillies have a nutty, slightly smoky flavour. They're lovely in salsas and stews. Harder to find in the UK but available from Cool Chile Co and MexGrocer.

Morita (5,000-10,000 SHU) - Medium

A smaller, darker chipotle variant that's smoked for less time, giving it a fruitier, less intensely smoky flavour. Used interchangeably with regular chipotles in many recipes. Available from specialist UK shops.

How to Prepare Dried Chillies

Toasting

Heat a dry frying pan or comal over medium heat. Press the chillies flat with a spatula for about 15-30 seconds per side until they become fragrant and slightly change colour. Be careful not to burn them - burnt chillies taste bitter and acrid. Open a window, as the fumes can make you cough.

Rehydrating

After toasting, remove the stems and seeds (for milder flavour) and place the chillies in a bowl. Pour over just-boiled water and leave to soak for 20-30 minutes until soft and pliable. The soaking liquid (just a small amount) can be added to your sauce for extra flavour, but don't use too much as it can be bitter.

Blending

Transfer the rehydrated chillies to a blender with a splash of the soaking liquid, garlic, and any other sauce ingredients. Blend until very smooth. For the silkiest sauces, push the blended mixture through a fine sieve to remove any remaining skin fragments.

UK Substitution Guide

When you can't find the chilli you need, here are reliable UK-available substitutes:

• Ancho: Use 1 tablespoon sweet smoked paprika plus a pinch of cocoa powder per chilli
• Guajillo: Use New Mexico chilli powder, or 1 tablespoon sweet paprika plus a pinch of cayenne
• Chipotle: Chipotle paste from Tesco/Sainsbury's, or smoked paprika plus a dash of Tabasco
• Pasilla: Ancho plus a pinch of cocoa - not perfect but workable
• Chile de árbol: Dried bird's eye chillies from Asian shops, or crushed red pepper flakes
• Habanero: Scotch bonnet (virtually identical heat and similar fruity flavour)

Where to Buy Dried Chillies in the UK

Your best options for a wide range of authentic dried Mexican chillies in Britain:

• Cool Chile Co (coolchile.co.uk) - the original UK specialist, excellent quality
• MexGrocer (mexgrocer.co.uk) - wide range, competitive prices, fast delivery
• Sous Chef (souschef.co.uk) - premium quality, well-curated selection
• Amazon UK - increasingly good selection, Prime delivery available
• Ocado - stocks some dried chillies and chipotle products

Dried chillies keep for up to a year in a cool, dark cupboard in an airtight container. Stock up when you find good sources and you'll always have them to hand. For more on using these chillies in actual dishes, explore our recipe collection where many dishes include specific chilli recommendations and preparation tips.

Building a Dried Chilli Collection

For UK cooks just starting their Mexican cooking journey, we recommend building your dried chilli collection gradually. Start with three essentials: ancho (for moles and enchilada sauce), chipotle (for smoky flavour in almost anything), and chile de árbol (for adding heat). These three cover approximately 80% of Mexican recipes. Once comfortable with those, add guajillo (for red salsas and birria) and pasilla (for mole negro and complex sauces). Finally, for the adventurous cook, explore cascabel, morita, and habanero for regional specialities. Store all dried chillies in airtight containers or resealable bags in a cool, dark cupboard - a well-organised collection is a joy to cook from and will transform your Mexican cooking.

Cooking with Dried Chillies: Beyond Sauces

While sauces and salsas are the primary use for dried chillies, they're also wonderful in other preparations. Toast and grind chiles de árbol into a powder to sprinkle over popcorn, eggs, or avocado toast. Infuse oil with dried chipotles for a smoky drizzle that elevates roasted vegetables, grilled meats, and even pasta. Add a whole ancho or guajillo to a pot of beans as they simmer - it dissolves slowly and adds an incredible depth of flavour. Dried chillies can also be rehydrated and stuffed: anchos stuffed with cheese, battered, and fried make chiles rellenos, while chipotles stuffed with cream cheese make an excellent appetiser. The possibilities extend far beyond the traditional sauce applications, and experimenting with dried chillies in everyday cooking is one of the most rewarding aspects of exploring Mexican cuisine in a British kitchen.

Chilli Heat and British Palates

If you're new to dried chillies, start with the mild end of the scale. Ancho (1,000-2,000 SHU) and pasilla (1,000-2,500 SHU) are gentle enough for anyone who enjoys a mild curry. Guajillo (2,500-5,000 SHU) is comparable to a standard jalapeño. Chipotle (5,000-10,000 SHU) delivers noticeable warmth but nothing alarming. Chile de árbol (15,000-30,000 SHU) is where it gets properly spicy - think Nando's "Hot" territory. Habanero (100,000-350,000 SHU) is serious heat for chilli enthusiasts only. Remember that dried chillies are always cooked into sauces, stews, and salsas where the heat is distributed across the entire dish, so a single hot chilli in a pot that serves 6-8 people produces a very manageable level of spice. You can also remove the seeds and veins (where most of the capsaicin concentrates) before use for a milder result.