Core and chop the tomatoes. Peel the garlic and onions and chop roughly. Remove the top of the chili pepper and cut into several pieces.
Add olive oil to a heavy saucepan, heat to medium-high, and sauté onion and garlic for 2-3 minutes. Add tomato and vegetable stock, and reduce until sauce thickens, about 60 minutes. Let cool.
Put in blender with basil, parsley, and 1 chili pepper. Blend until smooth. Taste and add additional peppers until the mix has the kick you want. Place in refrigerator and chill completely.
Once cool, add lemon juice and sea salt (if using) and mix using a wire whip. Add one ounce (shot glass or jigger/30 ml) of vodka to about 6 oz. (175 ml) of the mix and stir thoroughly. Serve with a celery stick garnish.