Kohlrabi burger

Ingredients

• 2 kohlrabi
• 30 g flour
• salt
• spicy paprika powder
• 1 egg
• 50 g breadcrumbs
• 30 g grated parmesan
• 50 g butter
• 500 g sour apple
• 1 onion
• 1 clove of garlic
• 1 small green chili
• 1 tbs sugar
• 2 tbs apple cider vinegar
• 2 stalks peppermint
• salt, pepper
• 1 tomato
• 4 hamburger rolls
• a few salad leaves