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about 1 cup

Adjust the heat accordingly. More seeds = more heat. Keep in mind, however, that the heat is the strongest the day you make the sauce and starts to dissipate gradually. This sauce keeps for a long time, and after a couple of weeks, you can’t even taste the pepper.

Ingredients

3 large garlic cloves, peeled
2 red Jalapeño or Serrano peppers, deseeded (See note #1 below.)
¼ cup white distilled vinegar
½ cup sugar
¾ cup water
½ tablespoon salt
1 tablespoon cornstarch or potato starch (See note #2 below.)
2 tablespoons water

Preparation

In the blender, purée together all the ingredients, except for the last two.
Transfer the mixture to a saucepan and bring to a boil over medium-high heat. Lower the heat to medium and simmer until the mixture thickens up a bit and the garlic-pepper bits begin to soften, about 3 minutes.
Combine the cornstarch and water to make a slurry. Whisk in the cornstarch mixture and continue to simmer one more minute. The cornstarch will help the sauce to thicken slightly thereby causing nice suspension of the garlic-pepper bits; otherwise, you get a thin sauce with all the little pieces floating on the surface.
Let cool completely before storing in a glass jar and refrigerate.