Wash and open oysters. Over each oyster, drop a few drops of lemon juice. Sprinkle with salt and pepper, chopped pimento, and green pepper. Stand half slice of pineapple in each shell. Drop melted butter over all. Place oysters in hot oven, 450 degrees, for 10 or dozen minutes or under broiler for 5 minutes, until pineapple is lightly brown. Serve while hot. Good with cole slaw.