Pour the milk into a pot and heat it over medium-low heat.
When the milk is lukewarm, turn off the heat and add plain yogurt. Mix well.
Pour the mixed milk into a clean, airtight container and ferment at room temperature for 8-10 hours.
Pour the fermented yogurt into a cheesecloth and drain in the refrigerator for 3-4 hours.
Wash and finely chop the strawberries.
In a pot, add the chopped strawberries, sugar, and lemon juice. Simmer over medium-low heat, stirring continuously.
Once thickened, turn off the heat and let it cool.
Serve the Greek yogurt in a bowl and top it with strawberry jam to finish.