I remember asparagus jokes in the first volume, and beef-in-aspic in (I think) the second. But I do not remember that much about food. Actually, I probably remember more about food from Homer than from Proust.
Yes, OK, madeleines. I think that A.J. Liebling said something to the effect, If he could do that with madeleines, just think what he could do with cassoulet. (My copy of Between Meals: An Appetite for Paris was recently damaged in a flood, and has not yet been replaced.)