Heat the milk on medium to low heat until it reaches 200 degrees, stirring often to prevent burning.
Add the ¼ cup of lemon juice and stir. The milk will start to curdle.
Remove from heat, cover, and let sit for a few minutes to fully curdle.
Strain the curds through a cheesecloth or napkin-lined strainer, reserving the liquid whey.
Wrap the curds in the cloth and hang to allow the remaining liquid to drain out.
Once cooled, squeeze out any remaining liquid from the curds.
The curds are now farmer's cheese or ricotta. Blend half to make cream cheese.
Mix the remaining farmer's cheese with blackberries to make a blackberry cream cheese.
