Olive oil, for frying
2 cups buttermilk
2 cups Italian-style breadcrumbs
1/2 pound, small, shucked clams, about 20 to 25
1/2 pound, small, shucked oysters, about 8 to 10
1 lemon, cut in 1/2
Sea salt
1 1/2 cups marinara or arrabiata sauce (store bought or homemade), warmed
1/4 teaspoon red pepper flakes, optional, if using marinara (not arrabiata) sauce