1.5 pounds red jalapeno peppers – about 25 peppers or so. 1 medium yellow onion, chopped 5 cloves garlic, chopped 8 ounces tomato sauce ¼ cup red wine vinegar 1 teaspoon lemon juice Salt to taste Heat your oven to 350 degrees. Slice the jalapeno peppers in half lengthwise and remove the stems. Set them onto a lightly oiled baking sheet and bake 20-25 minutes, or until the skins blister. Remove from heat and cover with aluminum foil or in a bag to allow them to steam.