The prologue mentions how the summoner eats a lot of garlic to help you visualize how gross he smelt and presented himself. He'd definitely whip up this nice meal because it included two of his favorite things, beer and garlic.
beeramisu recipe - like Tiramisu but with beer (stout actually) uses mascarpone and ladyfingers. Toast the ladyfingers so they don't turn to mush. Very rich. I used this recipe for a regular Tiramisu with gingersnaps and was