Heat up the oil in a large pot set over a low to medium heat, then add the peeled and chopped onion and fry until golden.
Add the peeled and chopped garlic, baby potatoes cut in half, carrot, peas and cooked turkey.
Give everything a good stir.
Pour over the stock, place a lid on the pot and leave it to simmer on a medium heat until the veggies are tender.
Add the cream to a small bowl or ramekin, and pour over a tablespoon of the hot soup.
Mix it well, then add 2-3 more tablespoons of soup, mixing after each addition.
Remove the pot of soup from the heat, add the cream, mix it, then return the pot to the heat.
Add the tomato paste, tarragon, season with salt and pepper and garnish with fresh parsley.