For super quick and easy canapes, buy little croustini tart cases and fill with 1/2 tsp of fresh mayonnaise, a tsp of white crab meat, a squeeze of lemon, a little black caviar and a dusting of gold or silver leaf. I find that putting the mayonnaise into a pipping bag means that I can fill 50 cases neatly in no time at all. If you do not like caviar, you could always top with a small prawn or a thin slice of avocado.