Leek and Mushroom Custards

Savoury custards (‘flans’ or ‘royales’ as the French quaintly call them) are nothing but quiche mixtures without the pastry. There are endless variations on this theme, of which the recipes that follow are only two examples. This is a simpler version of one using artichokes I used to serve in the restaurants, where four artichoke hearts replaced the leeks. It is also less rich, so we can serve it with a hollandaise sauce let down with a little water and fl