Canning Salsa Cautions and Reminders Follow the directions carefully for each recipe. Use the amounts of each vegetable (peppers, onions, etc.) listed in the recipe. Add the amount of vinegar or lemon juice listed. Do not thicken salsas with flour, cornstarch or other starches before canning. If a thicker salsa is desired, add these ingredients … Continue reading Canning Salsa Cautions and Reminders →