Jalapeño Cheese Sauce

This sauce isn't simply melted cheese, but a classic Béchamel-based sauce made famous by Tex-Mex cuisine. The secret lies in the flour-butter base (roux), which stabilises the milk so the cheese doesn't split but forms a creamy, velvety emulsion. The acidity and heat of the jalapeño are needed to cut through the fatty richness of the cheese, making every bite feel fresh.
🕒 Prep Time 10 mins
🍳 Cook Time 15 mins
Total Time 25 mins
🍽️ Servings 4 servings
🔥 Calories 310 kcal
🌍 Cuisine Mexican

Ingredients

Equipment Needed

  • Heavy-based saucepan (for even heat distribution)
  • Whisk (for lump-free sauce)
  • Cheese grater (for fresh grating)
  • Chopping board and knife

Allergen Information

⚠️ Milk
⚠️ Cereals containing gluten

Instructions

1

Prepare the ingredients: grate the cheese and garlic, and finely chop the jalapeño.

Tip: Always grate cheese when cold so it doesn't smear, but let it warm to room temperature before use to melt easier.
2

Melt the butter in a medium saucepan over medium heat. When foaming, add the flour and stir continuously for 1-2 minutes until pale biscuit coloured.

Tip: This is called a roux. It's important to cook the flour a little (cook out the raw taste), otherwise the sauce will taste floury.
3

Gradually pour the milk into the butter-flour mix in small batches while whisking continuously and quickly.

Tip: If you pour the milk in all at once, it will clump. Gradual addition is key to a smooth texture (emulsion).
4

Cook the sauce on low heat until thickened (approx. 3-4 minutes), then remove from the heat.

Tip: Definitely lower the heat or remove from the hob before adding the cheese, as high heat causes cheese to split.
5

Stir in the grated cheese a handful at a time until completely melted and uniform. Then add the garlic and jalapeño.

Tip: The intensity of flavour may vary depending on the maturity of the cheddar.
6

Season with salt and pepper. Taste and correct if necessary.

Tip: Be careful with salt as the cheese can be salty itself.
7

Serve immediately warm with tortilla chips or vegetables.

Tip: As it cools, the sauce will form a skin on top; prevent this by stirring or covering with foil.

Recipe FAQ

Why did the sauce become grainy?
You likely cooked the cheese at too high a heat, or it wasn't fatty enough. The cheese proteins seized up.
Can I use pre-grated cheese?
Not recommended. Shop-bought grated cheese has anti-caking powder (starch) which prevents the sauce from being completely smooth and glossy.
It became too thick, what should I do?
Stir in a little more warm milk until it reaches the desired consistency.

Ingredients

  • 200 g Cheddar cheese (block, freshly grated)
  • 50 g Jalapeño peppers (sliced, or fresh diced)
  • 30 g Butter (room temperature)
  • 200 ml Milk (at least 2.8% fat)
  • 20 g Plain flour
  • 1 clove Garlic (finely grated)
  • 0.5 tsp Salt
  • 0.25 tsp Pepper (freshly ground)