Refrigerated sriracha will keep for up to 3 months.
3/4 pound red jalapeño peppers, stems removed, roughly chopped
1/4 pound red serrano peppers, stems removed, roughly chopped
1/2 pound green jalapeños, stems removed, roughly chopped
4 garlic cloves
1/4 cup granulated sugar
1/4 cup brown sugar
1-2 teaspoons salt
1/2 cup distilled white vinegar
1 teaspoon xanthan gum 
- Place peppers, garlic, sugars, and salt in a food processor, and pulse until roughly chopped. Transfer mixture to a clean container, cover, and let sit at room temperature. A mason jar with a loose-fitting lid or a clean bowl with plastic wrap will work. Fermentation should begin in about 2 days. When bubbles begin to form, stir your "mash" once or twice a day to combine and help settle. Continue until the mixture stops bubbling, about 6 to 8 days.
- Transfer the mash to a blender, add the vinegar, and puree until very smooth. Strain the sauce through a fine sieve. Add xanthan gum, and puree again until it's smooth and thick.
- About 2 cups