01 - Combine the chopped rhubarb, sugar, vanilla extract, and lemon juice in a saucepan. Cook over medium heat, stirring occasionally, until the rhubarb is tender and has broken down, about 15-20 minutes.
02 - In a bowl, mix the quark with honey (if using) and vanilla extract until smooth.
03 - Once the rhubarb compote is ready, remove it from the heat and let it cool slightly.
04 - Spoon the vanilla quark into bowls and top with the warm rhubarb compote.