1 tablespoonful Jam. 1/2 pint Water 1 oz. Sugar 1 teaspoonful Cornflour 1/2 Lemon. Time–5 Minutes. Put the water, jam, lemon juice, and sugar into a small saucepan and boil it for five minutes. Mix the cornflour with a little cold water and pour it in; stir till it boils up. Strain the jam out, and it is ready to serve; a few drops of cochineal improve the colour.