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6 cups water
10 lemons, thickly sliced, seeds removed (or substitute limes for a different color)
8 to 10 red jalapeños, seeds and stems removed, halved
1/4 cup vegetable oil
Place the water in a large pot and bring to a boil. Add the lemon slices and boil for 20 minutes. Strain, reserving the water.
Place the jalapeños in a blender and add the oil. Puree to make a thick paste. Add the lemon slices, a few at a time, along with 3 cups of the reserved water, a half cup at a time. You may have to do this in batches in you don’t have a large blender. Puree to a thick sauce. Pour into bottles and label.