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1/4 cup fresh flat-leaf parsley leaves, roughly chopped

1/4 teaspoon crushed red pepper flakes

3 small cloves garlic, finely grated (about 1 teaspoon)

1 stick (8 tablespoons) unsalted butter, at room temperature

1 lemon, zested and juiced

Kosher salt

1 tablespoon olive oil 

1/4 cup plain breadcrumbs

One 14-ounce can cherry tomatoes or diced tomatoes (don't drain)  

Two 6.5-ounce cans chopped clams (don't drain)

8 ounces angel hair pasta, broken in half