Beef burgers with apple relish

Ingredients

• 2 apples Südtiroler Apfel PGI (Granny Smith)
• 0,5 tsp ginger
• 3 tbsps. cane sugar
• 2,5 tbsps. apple vinegar
• 1 sticks cinnamon
• 1 pinches paprika flakes
• Approx. 150 ml water
• 1/3 tsps. salt
• 1 pinches pepper
• 280 g minced beef
• 1 pinch salt
• 1 pinch pepper
• 4 brioche buns (hamburger rolls)
• 1 handful of lettuce leaves of your choice
• 2 red onions