Question: why are some shishito peppers hot?
Answer: What Causes Only One in Ten Shishito Peppers to be Spicy? Many chili peppers offer a large range of heat from pod to pod due to the amount of capsaicin produced during growing. For example, jalapeno peppers typically range from 2,500 to 8,000 Scoville Heat Units, which is quite a large range.