Two main products are used to ferment yogurt: milk and sourdough. In the absence of dry milk starter, a jar of natural yogurt is quite suitable for fermentation of milk
(brand trust), fat content of at least 3%. 150-200 g of ready-made yogurt is enough for 1 liter of milk. According to this recipe, dessert yogurt with chocolate and strawberries will be prepared, so starter starter (ready-made yogurt) is taken in larger quantities so that the yogurt clot can withstand the weight of additional additives. To make yogurt, milk should have a temperature of 40 degrees, not higher. Already at 50 degrees, bacteria can die, fermentation will not occur. Heat the milk to a hot state (I use pasteurized milk, which is brought to a boil). Put the chocolate in the milk, melt the chocolate with constant stirring. Allow the milk mixture to cool to an acceptable temperature (it is convenient to cool the mixture in a sink with cold water).