Asparagus and Gabriel cheese gratin

I like asparagus roasted, grilled, warm in salads or dunked in mayonnaise, and all the other ways it likes to be done, but this is my favourite asparagus dish and the first one I reach for when the season starts. There are strong flavours here, so balance is important, which is why I like to do each plate separately. Too much of the cream sauce can drown the asparagus, too much of the crumble will spoil the texture as well as the flavour, and even the balance in the crumble is variable. Gab