If flavors were sounds, the lemon in Marc Cassell's lobster roll would be the faintest whisper. The subtlety should be noted. In a city that has turned lobster rolls into a fetish, most restaurants create versions with way too much noise. Mayonnaise is often used in excess, or they're weighed down with butter. Sometimes the lobster meat comes in frozen. At 20 Feet, everything is as it should be. Lobsters are brought in live and steamed in batches before their shells are picked clean. The knuckles and tails get dressed in the tiniest bit of mayo brightened with lemon, and the simple salad gets tucked into a house-baked bun. That's it. That's the whole recipe. And that's why 20 Feet serves the best lobster roll in town.