The Essential Guide to Mexican Chillies Available in the UK

Your Complete Guide to Mexican Chillies in Britain

Mexican cuisine is built on chillies. Not just for heat, but for depth, complexity and character that no other ingredient can provide. Mexico boasts over 60 varieties of chilli, each with its own personality, ranging from the gentle warmth of the ancho to the searing fire of the habanero.

The good news for UK-based Mexican food enthusiasts? Many of these essential chillies are now available across Britain, whether through specialist shops, online retailers or even mainstream supermarkets. This guide will walk you through the most important varieties, their flavour profiles, heat levels and precisely where to find them.

Understanding the Scoville Scale

Before diving into specific varieties, it helps to understand how chilli heat is measured. The Scoville Heat Unit (SHU) scale rates the concentration of capsaicin, the compound responsible for the burning sensation. For reference, a standard bell pepper scores 0 SHU, whilst a jalapeño sits between 2,500 and 8,000 SHU.

Remember that heat varies between individual chillies, even within the same variety. Growing conditions, ripeness and even the specific plant all affect the final heat level. The ratings below represent typical ranges.

Dried Chillies: The Foundation of Mexican Cooking

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

The ancho is a dried poblano pepper and arguably the single most important chilli in Mexican cooking. Its name means "wide" in Spanish, referring to its broad, flat shape. The flavour is rich and fruity with notes of dried plum, raisin and a subtle chocolate undertone.

Essential uses: Mole poblano, enchilada sauce, adobo marinades and tamale fillings. Without ancho chillies, authentic mole is simply impossible.

Where to buy in the UK: Available at Cool Chile Co (online), MexGrocer, Waitrose (selected branches stock La Costena brand), and specialist Latin American shops in London, Manchester and Birmingham. Expect to pay £3-5 for a 75g bag.

Storage tip: Keep in an airtight container in a cool, dark cupboard. They will maintain their flavour for up to 12 months.

Guajillo Chilli (2,500-5,000 SHU)

The guajillo is Mexico's workhorse chilli. Smooth-skinned, deep red and with a clean, slightly tangy flavour, it appears in more everyday Mexican dishes than any other dried variety. Think of it as the all-rounder of the chilli world.

Essential uses: Red salsa for tacos, pozole, birria, enchilada sauce and countless marinades. Street food vendors across Mexico rely on guajillo as their primary chilli.

Where to buy in the UK: Often sold alongside ancho chillies in Latin American shops. Also available from specialist Mexican ingredient shops and online retailers.

Preparation tip: Remove seeds and veins, toast briefly in a dry frying pan (30 seconds per side), then soak in hot water for 15-20 minutes. Save the soaking liquid for your sauce.

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

A chipotle is a ripe (red) jalapeño that has been smoke-dried. The resulting flavour is deeply smoky, sweet and complex. Chipotles have become one of Mexico's most recognisable flavours worldwide.

Essential uses: Chipotle in adobo sauce, smoky marinades, chipotle mayonnaise and BBQ-style sauces.

Where to buy in the UK: Tinned chipotles in adobo (La Costena or San Marcos brands) are increasingly available in Tesco, Sainsbury's and Waitrose in the international foods aisle. A 215g tin costs around £2-3. Dried chipotle chillies are available from Cool Chile Co and MexGrocer.

Chef's tip: Once you open a tin, transfer unused chipotles to an ice cube tray, cover with the adobo sauce and freeze. Each cube is perfect for a single recipe.

Chile de Arbol (15,000-30,000 SHU)

Small, slender and bright red, the chile de árbol delivers clean, direct heat. It is the chilli behind the fiery table salsas served at Mexican taqueria stalls.

Essential uses: Table salsa, salsa macha, chilli oil and as a general heat booster.

Where to buy in the UK: Available from online Mexican ingredient retailers and some Latin American shops. Dried bird's eye chillies or cayenne can substitute in a pinch, though the flavour profile differs.

Pasilla Chilli (1,000-4,000 SHU)

Long, dark and wrinkled, the pasilla (also called chile negro) has an elegant, complex flavour with notes of cocoa, liquorice and dried berries. It is essential for Oaxacan black mole.

Where to buy in the UK: Less common than ancho or guajillo, but available from specialist online retailers like Cool Chile Co and MexGrocer.

Fresh Chillies Available in British Shops

Jalapeño (2,500-8,000 SHU)

The world's most famous chilli needs little introduction. Green, fleshy and with an accessible level of heat, the jalapeño is the gateway chilli for most British cooks exploring Mexican cuisine.

Essential uses: Salsa verde, pico de gallo, nachos, pickled jalapeños and stuffed jalapeños.

Where to buy in the UK: Pickled jalapeño slices are available in virtually every UK supermarket. Fresh jalapeños are increasingly stocked by Tesco, Sainsbury's, Waitrose and M&S, typically in the fresh chilli section alongside scotch bonnets and bird's eye chillies.

Serrano (10,000-23,000 SHU)

Smaller and hotter than the jalapeño, the serrano is the everyday fresh chilli in Mexican home kitchens. When a Mexican recipe simply says "add a chilli," it usually means a serrano.

Where to buy in the UK: Difficult to find fresh in Britain. Your best substitutes are the hotter specimens from a bag of green finger chillies, available at most supermarkets and greengrocers.

Habanero (100,000-350,000 SHU)

The habanero is one of the world's hottest commonly used chillies and is fundamental to Yucatecan cuisine. Despite its fearsome heat, it has a remarkably fruity, floral aroma that is quite unlike any other chilli.

Essential uses: Habanero salsa, cochinita pibil, Yucatecan pickled onions and hot sauces.

Where to buy in the UK: Scotch bonnet peppers, widely available in UK supermarkets, are closely related to habaneros and make an excellent substitute with a very similar heat level and fruity character. Some larger Tesco and Morrisons stores stock actual habaneros.

Safety note: Always wear gloves when handling habaneros. The capsaicin can cause painful skin and eye irritation that lasts for hours.

How to Toast and Rehydrate Dried Chillies

This technique is fundamental to Mexican cooking and unlocks the full potential of dried chillies:

1. Split the chillies open and remove the seeds and veins (keep them if you want extra heat).
2. Heat a heavy-based frying pan or cast iron skillet over medium-high heat without oil.
3. Press the chillies flat against the pan with a spatula for 15-30 seconds per side.
4. They should change colour slightly and release a rich, toasty aroma. If they begin to smoke heavily, reduce the heat.
5. Transfer to a bowl and cover with hot (not boiling) water. Soak for 15-20 minutes until soft and pliable.
6. Blend with garlic, salt and some of the soaking liquid to create a base sauce.

This process forms the foundation of virtually every authentic Mexican red sauce. Master it and you have unlocked the heart of Mexican cooking.

Building Your UK Chilli Cupboard

If you are just starting out, begin with these three varieties:

• Ancho - for rich, mild sauces and moles
• Guajillo - for everyday red salsas and marinades
• Chipotle in adobo (tinned) - for smoky depth in any dish

With just these three, you can prepare roughly 70% of Mexican recipes. Add fresh jalapeños and a bag of chile de árbol and you will cover nearly everything.

UK Substitution Guide

When you cannot find the exact chilli, these British-available alternatives work well:

• Serrano → Green finger chillies (slightly less heat)
• Poblano → Italian sweet peppers or pointed peppers
• Habanero → Scotch bonnet (nearly identical heat and fruitiness)
• Chile de árbol → Dried bird's eye chillies or cayenne
• Guajillo → New Mexico red chillies (milder, but similar profile)

Browse our recipe collection to put your new chilli knowledge into practice, and check our UK Mexican shops directory for stockists near you. For restaurant-quality Mexican food featuring these authentic chillies, explore our guide to Mexican restaurants across the UK.