Spicy Sweet Corn Chowder

Name: Spicy Sweet Corn Chowder
Ingredients: 8 oz 225g ground bulk Chorizo sausage; 2 stalks celery (finely chopped); 2 large carrots (finely chopped); ½ large white onion (finely chopped); 4 cloves fresh garlic (finely minced); 1 jalapeno pepper (finely chopped); 6 cups chicken or vegetable stock; 2 lbs 900g. Russet potatoes, chopped; 4 ears sweet corn (kernels only); 2 tsp. fresh oregano; 1 bay leaf; Sea salt and black pepper (to taste); ½ cup half and half (single cream, tempered); fresh chives to garnish (optional)