Peel and dice the onions, then sauté them in a pot with vegetable oil until translucent. Add the frozen peas and fry for about 3-4 minutes.Next, add the vegetable stock and cook for about 5 minutes until the peas are soft. Puree the soup and stir in the vegan crème fraîche. Season to taste with salt and pepper.Slice the vegan sausages and warm them in the soup for about 3-4 minutes.