Step 1

Thinly slice the leeks and wash to remove any dirt or debris (see how to clean leeks).

Step 2

Melt the butter in a frying pan over a medium heat. Add the sliced leeks and cook, stirring often for a few minutes.

Step 3

Reduce the heat, cover the pan with a lid and let the leeks soften and ‘sweat’ for 7-10 minutes, stirring often. Check often so they don’t brown or scorch in the pan.

Step 4

Increase the heat to medium and stir in the cream, blue cheese, mustard, salt and pepper. Stir until the cheese melts and the sauce thickens.

Step 5

Serve warm as a side dish, or on slices of toasted sourdough.