Meanwhile, chop pork trimmings coarse. Transfer to Dutch oven. Add water and bring to simmer over high heat. Cook, adjusting heat to maintain vigorous simmer and stirring occasionally, until all liquid evaporates and trimmings begin to sizzle, about 12 minutes. Continue to cook, stirring frequently, until dark fond forms on bottom of pot and trimmings have browned and crisped, about 6 minutes longer. Using slotted spoon, discard trimmings. Pour off all but 2 tablespoons fat; set aside pot.