The day before dinner, mix together all the ingredients, except the shrimp, in a large bowl. Taste it when it’s made, to adjust any flavors. It should have heat but not burn, and taste in a balanced way of lime and pineapple. Cover the bowl with a silicone lid or plastic wrap and store it in the fridge overnight. Rinse the iceberg lettuce pieces and select ones in a cup-shape, dry them in a spinner, and keep them in a plastic bag overnight in the fridge.