Blue Cheese burger with red onion relish | Castello®

Ingredients

• 300 ml water
• 50 ml oil
• 1 large egg
• 1 egg for brushing
• 15 g yeast
• 1 tsp salt
• 1 tbsp sugar
• 150 g durum wheat flour
• 400 g wheat flour
• 60 g butter
• sesame seeds to sprinkle on top
• 5 - 6 red onions
• 25 g butter
• 2 tbsp brown sugar
• 2 - 3 sprigs of thyme (or a half tsp of dried thyme)
• 100 ml red wine (can be omitted)
• 100 ml balsamic vinegar or sherry vinegar
• salt
• pepper
• tbsp mayonnaise
• 4 tbsp honey
• 1 - 2 tbsp coarse ground mustard
• lemon juice (to taste)
• 750 g beef mince
• 1 pack Castello® Blue cheese slices
• 1 large beef tomato
• salad