Next level tomato soup

Name: Next level tomato soup
Ingredients: 1.2kg ripe tomatoes of your choice (we like plum), halved; 6 garlic cloves sliced; ½ red chilli sliced (optional); 30g golden caster sugar; 1 tsp dried oregano; 100ml red wine vinegar; 100ml olive oil; 1 large bunch of basil; 2 onions sliced; 400ml vegetable stock; 200g white bread sourdough or another whole loaf (slightly stale bread works well), crusts trimmed away; 2 tbsp olive oil; 10g parmesan or vegetarian alternative, finely grated (optional)