NYT Cooking: You may not think of paella as a weeknight dish, but this half-hour recipe might change your mind. The trick is to start it on the stove and finish it in a superhot oven so you get a nice, crisp crust on the bottom. The name “paella” refers not to a combination of rice, seafood, sausage and other meats, but rather to the paellera, a large pan that looks like a flat wok. But you don't need one t...