1: Peel 2 avocados, then cut the flesh into large dice and put into a high-sided bowl. Pour in the juice of ½ lime, 2 tablespoons olive oil, 5 drops Tabasco, salt, pepper and 1 pinch vitamin C (optional).
2: Blend all of this together.
3: For a smoother mousse, you can pass this purée through a sieve, but this is not essential.