Cut the melon into quarters and remove the seeds. Remove the flesh from the skin and dice. Weigh 500 g. Scald peaches hot and quench cold. Peel off the skin. Halve the fruit, remove seeds and cut into slices.
Mix 2 tablespoons of sugar, gelling agent, fruit, champagne and citric acid in a large pot. Bring to the boil while stirring constantly. Add the remaining sugar. Bring to the boil again and boil for 1 minute until bubbly. Skim jam. Pour into prepared glasses and close immediately