Delicious, full of vegetables appetizer recipe.
Most of the heat from a jalapeno pepper is found in the seeds, so be sure to remove if you don't like a lot of heat. Also, when picking out the peppers, keep in mind that ones with lines or striations on them are hotter than smooth skinned peppers.
Also, and most importantly, be careful when cutting peppers that you don't touch your eyes or any other sensitive area. Even a thorough hand washing might not get rid of all the hot oil. You could also wear disposable gloves when cutting peppers.