Pepper, Anchovy and Onion Cornbread Tart

Name: Pepper, Anchovy and Onion Cornbread Tart
Prep time: 20 min
Cook time: 45 min
Total time: 45 min
Yield: 4 portions
Ingredients: 2 red onions; 2 Tbsp olive oil; 2 tsp balsamic vinegar; 1 pinch dried chilli flakes; 2 - 3 roasted red peppers, preserved; 10 - 12 pitted black olives; 1 Tbsp pickled capers; 20 g Parmesan cheese; 150 g polenta; 40 g plain flour; 1 ¼ tsp baking powder; ½ tsp bicarbonate of soda; 1 tsp soft brown sugar; ½ tsp fine sea salt; 2 medium eggs; 120 g milk; 45 g groundnut oil; 15 g unsalted butter