We don't know what it is, exactly, but certain cuisines and certain restaurants are always better when the weather is right. A smoothie is always sweeter when the sun is out. A plate of goulash or bowl of borscht always tastes better in the frozen dead of winter. And a rainy day always — always — makes the food at Bagel Deli taste better. On such days, we like to take a quick turn around the market shelves and then settle into one of the well-worn booths where, as the rain patters down, we order up a cup of watery coffee and a nice scrambled-eggs-and-salami plate, maybe some latkes, rugelach or matzoh ball soup. The Bagel Deli also has some good sunny-day picnic food — thick sandwiches and good egg salad and a sixer of Dr. Brown's from the shelf. Still, when the rain is coming down, we always find ourselves heading straight for the Bagel Deli.