{12 oz/375g} of unsweetened quick-frozen raspberries • {4 oz/125g} sugar • {2 fl oz/60ml} water • chambord or other raspberry-flavored liqueur • cornstarch {cornflour} • Vegetable oil • fresh lemon juice • Ripe peach,4,pealed,pitted,and cut into ½inch{12mm}thick slices • vanilla ice cream