Question: how spicy are serrano peppers?
Answer: On the Scoville scale, Serrano peppers have 10,000 to 20,000 SHU. Serranos are far from the hottest peppers on the planet (the Carolina Reaper ranks first at 1,400,000 SHU) but the serrano pepper is still a hot chile. ... Jalapeño pepper: 4,000 - 10,000 SHU. Serrano pepper: 10,000 - 20,000 SHU.