I made butter poached shrimp last weekend using the following method, but added a little cayenne It was outrageously good, so i'm planning on using it with scallops and lobster in the near term.
Add 2 tablespoons water in a saucepan that is just large enough to hold the butter and shrimp/prawns. Bring the water just to a simmer over medium-high heat. Add a chunk of butter and whisk continuously as the butter melts. When the butter has begun to melt and emulsify into the water, add three more chunks and continue to whisk. (Or you can swirl the butter in the pan; it needs to keep moving?how you do it is up to you.) When all the butter is incorporated, add the shellfish and stir. Keep the pan on medium-high heat until the butter gets hot again. Use an instant-read thermometer to maintain a temperature just below a simmer, 170? to 180?F/77? to 82?C. Don?t let the butter to boil. Cook for 3 to 5 minutes. Remove a shrimp, cut it open, and check that it?s just cooked through. It should be white at the center, not translucent gray, and tender and juicy