Pea, ham & sausage soup

Name: Pea, ham & sausage soup
Prep time: 6 h 40 min
Cook time: 2 h 20 min
Total time: 9 h
Cuisine: European
Ingredients: 500g split peas; 18.20 gm olive oil; 30g unsalted butter; 2 onions, finely chopped; 1 carrot, finely chopped; 2 celery stalks, finely chopped; 2 smoked ham hocks; 250ml white wine; 250ml chicken stock; 2 tsp fresh thyme leaves; 2 bay leaves; Grated zest of 1 lemon; 150ml sour cream; 62.50 ml flat-leaf parsley, plus extra to serve; 8 mixed smoked sausages (such as cabanossi, Vienna frankfurts, kransky and bratwurst); Rye bread, to serve