In a large glass bowl add milk and buttermilk. Stir well and cover with a clean kitchen towel.

Let sit at room temperature for 24 hours. The mixture will thicken slightly.

Heat the oven to 125 F and shut off. Set the bowl uncovered into the oven for about 45 min. The mixture will change to yogurt like texture

Add a cheese cloth or a kitchen towel to a colander and set on a large bowl.

Pour the milk mixture into the colander, twist the ends and let drain for about 1 ½ to 2 hours.

The quark will be in the towel and the whey will be in the bowl.