Hearty chicken vegetable soup

Name: Hearty chicken vegetable soup
Prep time: 5 min
Cook time: 25 min
Total time: 30 min
Cuisine: European, Italian, Mediterranean
Ingredients: 1 tbsp olive oil; 1 large onion (, finely diced); 4 celery sticks (, finely diced); 3 carrots (, peeled and cubed); 1 large potato (, peeled and cubed); 150 g | 1 cup cubed butternut squash; 1 tsp salt; 1 tsp dried thyme or Italian seasoning; 1.4 litres | 6 cups hot chicken stock ((broth)); 900 g | 2 lbs chicken tenders ((mini chicken breasts)); 3-4 tbsp tomato paste; 1 zucchini ((courgette), cubed); 150 g | scant 1 cup sweet corn ((from a small tin, drained)); 150 g | 1/2 cup fregola or risoni pasta; 1 tbsp lemon juice; 2 tbsp parsley (, chopped, plus extra to serve); Salt and pepper to season; A little graded Parmesan to serve ((optional))