Güerito Peppers or cascabella peppers - A yellow chile, from the spanish word Güero - a general term meaning blond, or yellow. Delicious to prepare Bacalao a la Vizcaina.
These look like jalapeños but are smaller, tighter, and have a bright yellow color, like a reflective roadside construction jacket. Picked by hand, the peppers are brined in salt and water for a period of weeks and then finished with vinegar and yellow food dye. Tart, crisp, and scoring between 1,500 and 4,000 on the Scoville scale, cascabellas are often misidentified as banana peppers, pepperoncini, or Hungarian wax peppers.
These are excellent for a garnish or for chopping and adding to taco meat, or to kick up any dish. They're also good for adding to salads as you would with pepperoncinis.
Try these on your next pizza. Eat alongside the pizza or take a toothpick and make a whole in the pepper then sprinkle the juice from the pepper over one piece of pizza. You'll notice the bite your pizza has and make it your mode of operation for evermore.