Preheat a large skillet over medium heat. Add oil. When the oil is hot, add the onion and peppers. Cook and stir until vegetables are softened, 4 to 5 minutes. Push to one side of the pan.
1 tablespoon coconut oil, 1 small onion, diced into ½ inch pieces, 1 red bell pepper, cut into ½ inch pieces
Increase heat to medium high. Add the shrimp and cook until shrimp starts to curl, 3 minutes.
1 pound shelled and deveined shrimp, 51/60 count, thawed if frozen
Stir the sauce ingredients and add to pan, along with the pineapple. Stir and cook for 1 to 2 minutes, until shrimp is cooked through and sauce thickens.
1 cup chopped pineapple
To serve, spoon shrimp mixture into each lettuce cup, top with cashews and green onions.
8 large leaves bibb lettuce, ⅓ cup chopped cashews, 2 green onions, thinly sliced
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Notes
Shrimp cooking time: If you use larger or smaller shrimp than the 51/60, your cooking times will be longer or shorter based on the size of shrimp you use.
Serving size: The nutrition information is calculated for 2 lettuce wraps with one fourth of the shrimp and vegetable mixture. It may be that you will want to put less of the mixture on each lettuce leaf. In that case, you'll need more lettuce leaves, and one serving may be 3 to 4 wraps.
Serve on rice. If you prefer, serve sweet and sour shrimp on steamed rice instead of lettuce leaves. It can also be served on tortillas or wraps.