Since littlenecks vary in size, have your fishmonger weigh the 3 dozen clams. You might need to increase the number of clams you purchase to hit 5 pounds. Go for larger clams if possible, so as to maximize the amount of clam-y, brine-y liquor that’ll ultimately wind up in your sauce.

This is the moment to use the best cherry tomatoes you can find. Sungolds are at their peak right now, and if you can source them at a farmer’s market you will not regret it.