You can leave the skin of the peppers on or blanch them and remove their skins. Blanching and skinning will leave the peppers with a more tender finish. To blanch, place in salted, boiling water for 3–4 minutes. Remove from the water and peel off the skins. Split the peppers lengthways and remove all seeds and core. If you’re not blanching and skinning the peppers, just seed them.