Goat's Cheese Frittata Sandwiches with Caramelised Red Onion Chutney

Name: Goat's Cheese Frittata Sandwiches with Caramelised Red Onion Chutney
Prep time: 20 min
Cook time: 1 h 15 min
Total time: 1 h 15 min
Yield: 6 portions
Ingredients: 45 g olive oil; 500 g red onions; 200 g soft brown sugar; 2 tsp fine sea salt; 200 g red wine vinegar; 150 g fresh mushrooms; 50 g fresh baby spinach; 6 medium eggs; 45 g milk; 5 g fresh chives; ¾ tsp ground black pepper; 80 g soft goat's cheese; 500 g water; 2 - 3 Tbsp unsalted butter; 1 garlic clove; 2 baguettes; 12 slices back bacon; 12 Tbsp cream cheese; 6 slices tomato