Celeriac and Leek Soup

Name: Celeriac and Leek Soup
Prep time: 10 min
Cook time: 30 min
Total time: 40 min
Cuisine: European, British
Ingredients: 1 celeriac, peeled and chopped (about 4 cups); 1 leek, white part chopped (about 2 cups); 2 sticks celery, washed and choppped (about 2 cups); 1/2 cup raw cashews; 1.25 L vegetable stock (substitute with chicken stock); 3 tbsp olive oil; sea salt and black pepper; cream, to serve; chives, washed and chopped, to serve