In a saucepan, mix the flour and sugar, add the must a little at a time with the help of a whisk so as not to form lumps. Put on the stove (low heat) and mix until the mixture starts to boil and reaches a creamy consistency. Pour into molds and let cool before serving, decorated with grapes.
IF YOU DON'T HAVE THE MUST: Wash the grapes and peel off the berries, put them in a pot, crushing them a little with your hands to release the juice. Cook everything over low heat for 20 minutes. Pour, little by little, into a strainer, crushing well, removing what is left (peels and seeds), you will get the juice that will be used to make the SUGOI