Cut each roll in half and press each half into a 3x3-inch oval.
Combine lemon zest and sugar. Dip each oval into the melted butter and then press into the sugar, zest mixture. Line them up in a sprayed 9x5-inch loaf pan, each piece on its edge to make a loaf shape.
Cover with plastic wrap and let double in size. Remove wrap and bake at 350°F 25-30 minutes. Cover with foil last 5-10 minutes, if necessary, to prevent over browning.
Remove from pan to cool. Combine glaze ingredients and spread over warm lemon slices.