Corned Beef Fried Rice without tomatoes

2 tablespoons butter 2 tablespoons olive oil 2 large potatoes , cooked and cubed 1 large onion , chopped 2 garlic cloves , minced (optional) 1 red pepper,[...]

2 russet potatoes , potatoes (baking, about 1 pound) 1 large onion , cut into 3/4-inch pieces 1 large garlic clove , minced 1/4 cup unsalted butter 1 green[...]