– Handle the jalapeño with gloves. Although jalapeño is low on the Scoville scale, it still contains capsaicin and can cause a burning sensation on the skin. Use caution when handling peppers and avoid touching your face. – Taste your jalapeños before muddling. Jalapeños can range from mild to very hot. This spicy margarita recipe calls for 1 small jalapeño, however, if your jalapeño is extraordinarily spicy, use half a jalapeño or even just a few slices. You can always add more, but you can't subtract. Taste before muddling to prevent yourself from making your skinny spicy margarita too spicy.