Preheat a large nonstick skillet over medium-high heat, when hot add 1 tsp oil, swirl to coat. Add the garlic, ginger, onion, peppers, and a pinch of salt. Cook, stirring constantly, until the garlic just begins to get a bit browned. Immediately add the sauce mixture and stir constantly until thickened and reduced to about ¼ cup. Turn off the heat.