ARRANGE ONION SLICES EVENLY OVER THE BOTTOM OF THE SLOW COOKER, AND THEN PLACE THE ROAST ON TOP OF THE ONION. IN A BOWL, MIX TOGETHER WATER, SUGAR, VINEGAR, SOY SAUCE, KETCHUP, BLACK PEPPER, SALT, GARLIC POWDER, AND HOT SAUCE; POUR OVER ROAST.
COVER, AND COOK ON LOW FOR 6 TO 8 HOURS, OR ON HIGH FOR 3 TO 4 HOURS