4 large Yukon Gold potatoes, peeled, cut into 1/4-inch-thick slices
1 tablespoon butter
9 tablespoons extra-virgin olive oil
3 small onions, sliced
8 garlic cloves, thinly sliced
1 cup dry red wine
2 cups chicken stock or canned low-salt
chicken broth
1 14-ounce can diced tomatoes in juice
1 teaspoon dried oregano
1/3 cup Kalamata olives or other
brine-cured black olives
4 tablespoons chopped fresh parsley
6 7-ounce red snapper or blackfish fillets
