If you are using mostly clams or mussels, use the larger amount suggested. To make this moist enough to serve over pasta, add extra tomatoes or ½ cup of the pasta cooking water. Or serve as is with a baguette.
Combine in a large heavy skillet over medium heat:
Cook, stirring, until fragrant. Add:
Bring to a simmer and cook, stirring occasionally, until the tomatoes break up. Season to taste with:
Stir in:
Cover the skillet, reduce the heat to medium-low, and cook until the shellfish are cooked (or, in the case of whelk or octopus, heated through) and any mussels or clams have opened, 5 to 10 minutes. Garnish with: