HEAT oven to 350º F.
SPRAY 2 (8x4-inch) loaf pans with cooking spray. Add boiling water to jelly powder; stir 2 min. until completely dissolved. Mix cake mix, oil, zest, jelly and eggs in large bowl with mixer until blended. Pour into prepared pans.
BAKE 40 min. or until toothpick inserted in centres comes out clean. Pierce loaves with large fork at 1/2-inch intervals.
MIX sugar and juice until blended; carefully pour over loaves. Cool loaves in pans 30 min.; remove from pans to wire racks. Cool completely.
serving size = 1 slice (47 g)