Vanilla Mousse with Strawberries and Vanilla Sauce

You can decide how plain or rich you want this mousse to be by making it with cream cheese and double cream for extra richness, with sieved and blended cottage cheese and fromage frais for a low-fat version, with curd cheese and thick yoghurt for a medium-fat version or any combination of your choice. The consistency, however arrived at, should be that of thick cream or yoghurt, that is a coating consistency. You need pierced moulds to hold the mixture.