See the bottom of this column for the following recipes:
Tomatillo Green Salsa
Chile Salsa
Peach Salsa
Salsas are a mixture of low-acid foods, such as onions and peppers, with acidic foods such as tomatoes or other fruits. Preserving salsas can be tricky because of the various combinations of low-acid and acidic foods they contain.
The acidic foods, such as peaches, will protect the low-acid foods from spoiling the salsa and becoming unsafe to eat. Tomatoes are often thought to be acidic, but they are not as acidic as they used to be and won’t project those other low-acid ingredients from potential organism growth that can make you sick. For this reason, it is wise to follow a tested and researched recipe with a processing procedure that will produce a safe product.
It is very important to keep proper acid levels to keep the salsa safe when canning. Never reduce the amount of acid, such as fruit, vinegar or lemon or lime juice, in a salsa recipe. Choose unripe or nearly ripe fruit over over-ripe fruit, because the acidity level decreases in overripe fruit and may create an unsafe canned salsa. Do not increase the total amount of onions or peppers in a recipe. You can substitute one type of pepper for another or mild peppers for hot peppers. Also, you can interchange yellow and red onions but do not increase the total amount of onions called for in a recipe. You can alter the amount of herbs and spices in fruit salsa recipes.
If you find that the salsas are a little thin, do not thicken salsas with flour or cornstarch before canning. After you open a jar to use, you may pour off some of the liquid or thicken with cornstarch.