Sliced Avocado Salad

Divide the spinach, avocado and onion between 4 plates and season with salt and pepper.

Fry the bacon in a dry frying pan until crisp and brown. Add the walnuts to the pan and toast until lightly browned.

Spoon off most of the bacon fat from the pan, reduce the heat and add the olive oil until warmed through.

Remove from the heat, add the vinegar and mustard and whisk until thickened.