Scallops with asparagus

5 tablespoons butter 2 tablespoons olive oil 1 large sweet onion (such as Vidalia or Maui), halved, thickly sliced crosswise 4 garlic cloves, minced 24[...]

36 each bay scallops * 1 cup lemon juice or more if need 36 each mussels cleaned and de-bearded * 36 each asparagus * 1 each boston lettuce * 1 teaspoon[...]