Sweet and Spicy Pineapple Shrimp Stir Fry

butter

medium shrimp (peeled and deveined)

olive oil

fresh pineapple (sliced and cut bite-size or (1) 14 ounce can pineapple chunks, drained)

large red bell pepper (chopped into bite-size pieces)

spicy barbecue sauce or your favorite spicy store-bought sauce

green onions (sliced thin)