Vegan quark is a plant-based alternative to traditional quark, a type of soft, fresh cheese that is popular in Central and Eastern Europe. This is made using soy, and is dairy-free.
In a small bowl, combine the soy milk and vinegar. Let it sit for 5-10 minutes, until the mixture starts to curdle and thicken.
In a blender or food processor, combine the soy milk mixture, lemon juice, tofu, salt, and sugar (if using). Blend until smooth and creamy.
Transfer the mixture to a small saucepan and heat over medium heat, stirring frequently, until it reaches a thick and creamy consistency, about 5-10 minutes.
Remove from heat and let it cool to room temperature. Once cooled, transfer the quark to a container and store it in the refrigerator until ready to use.
Enjoy the quark as a spread, dip, or topping for your favorite dishes. It can be stored in the refrigerator for up to 5 days.