White Pizza Sauce with Herbs

Blend the basil (or your mix of other herbs) with the oil using a hand blender or small food processor — blitz until you get a smooth purée.

Stir the purée into the crème fraîche or sour cream until combined. Note: if you use sour cream, the sauce can turn quite thin depending on the quality — it'll still work fine, just spread a thinner layer on the base.

Season with salt and pepper, and squeeze in a little lemon juice if you like.