Mix the apples, water, ginger, lime juice, vanilla and sugar in a pan, bring to the boil, cover and cook over a low heat for approx. 20 mins. until soft. Puree the apple mixture and leave to cool.
Crunchy muesli mixture
Mix the nuts, oats, sea buckthorn, butter and salt, spread on a baking tray lined with baking paper.
Approx. 10 mins. in the centre of an oven preheated to 200°C. Remove and allow to cool slightly.
Combine the quark with 4 tbsp of the apple sauce, divide between bowls, top with the remainder of the apple sauce. Sprinkle the muesli on top.