Beetroot and Caramelised Onion Burger

Name: Beetroot and Caramelised Onion Burger
Prep time: 20 min
Cook time: 3 h 10 min
Total time: 3 h 10 min
Yield: 6 portions
Ingredients: 300 g strong white bread flour; 100 g strong wholemeal bread flour; 270 g soya milk; 2 tsp dried yeast; 15 g light brown sugar; 20 g olive oil; ½ tsp fine sea salt; olive oil; 2 Tbsp sesame seeds; 240 g tinned chickpeas; 250 g cooked beetroot; 30 g breadcrumbs; 1 - 2 pinches garlic powder; 4 sprigs fresh parsley; 10 g tomato purée; ½ tsp fine sea salt; 2 pinches ground black pepper; 300 g red onions; 50 g light brown sugar; 20 g vinegar; 1 - 2 pinches fine sea salt; mayonnaise; 60 g rocket salad; 1 beef tomato