Combine all ingredients and simmer until thick. This will take about 3 hours.
1 red onion, 1 white onion, 1 yellow onion, 6 pounds fresh tomatoes, 4 banana peppers, 2 Heatless Jalapeño Peppers, 3 sweet peppers, 3 6 ounce cans tomato paste, 1/2 cup white vinegar, 2 tablespoons garlic powder, 1 1/2 tablespoons salt, 1 tablespoon cayenne pepper, 1/2 teaspoons ground cumin, 1/4 cup brown sugar, 1/4 cup white sugar
To sterilize the jars and lids, drop them in boiling water (for at least 5 minutes). Spoon the salsa into the hot, sterilized jars, filling the jars to within 1/4 inch of the top. Run a knife around the insides of the jars after they have been filled to remove air bubbles. Next, wipe the rims of the jars with a moist paper towel to remove any food residue. Last, top with the lids, and screw on rings.
Place a rack in the bottom of a large stockpot and fill halfway with water. Bring the water to a boil over high heat and lower the jars into the pot. You should leave a 2 inch space between the jars. Next, pour in more boiling water until the water level is at least 1 inch above the tops of the jars. Bring the water to a full boil, cover the pot, and wait for 10 to 15 minutes.
Remove the jars from the stockpot and place onto a cloth-covered or wood surface until cool. Once they have cooled off, press the top of each lid with a finger to make sure that the seal is tight (lid does not move up or down at all).
Refrigerate after opening.