One-Tray Sausage, Greens and Beans Bake with Rosemary Pesto

Name: One-Tray Sausage, Greens and Beans Bake with Rosemary Pesto
Cuisine: European, British
Ingredients: 2 tbsp oil or butter; 1 large red onion, roughly sliced into wedges; 200g cherry tomatoes; 400g sausages (can also be veggie); 2 green or yellow courgettes, roughly chopped; 1 lemon, in small wedges; 1 tsp fennel seeds or dried basil; 1 handful of olives, pitted and halved; 720g cooked borlotti or other beans or a mix (3 x 400g tins, drained and rinsed); 300g cavolo nero or cabbage, shredded (I like savoy in this); Sea salt and black pepper; Rosemary leaves from 3 sprigs (about 1 heaped tbsp); 2 tsp maple syrup; 1 tbsp apple cider vinegar; 3 tbsp extra virgin olive oil; 2 garlic cloves; Roughly 8 nuts, such as walnuts or almonds, or ½2 a handful of sunflower seeds