Fresno peppers look a lot like jalapeños, so much so that they are often confused for each other. Fresnos are typically two to three inches long, slightly curved and tapering to a point. They have a smooth skin and mature from green to a fiery red, again very similar to a jalapeño. To really tell the difference, you would need to cut open the pepper and look at the thickness of the chili’s walls. Fresno peppers are thinner walled than jalapeños. This makes the Fresno a better drying chili, but the jalapeño a slightly better option for poppers recipes.