If the sauce made from fresh tomatoes, they rub through a sieve and boil with a pinch of salt until thickened. If using tomato paste, it is diluted with 1-2 tbsp water. Flour blurs with two cups cold water, pour 1 cup hot water, add salt and boil. Add the cooked tomato paste, sugar and cinnamon. The sauce boil on low heat 30 minutes, occasionally stirring to not burn.