Vegan quark is a great source for protein and calcium. It can be eaten both savoury or sweet.
Unfortunately it is not (yet) very common to find vegan quark in the supermarkets. But you can prepare something similar very easily.
A summery sandwich, light and low in fat.
With vegan quark. Which you can make yourself by draining vegan yogurt, if you cannot find it in your supermarket.
Great for a picnic. Or for school and office lunches.