Heat the oil and butter in a large pot on a medium high heat.
1 tablespoon oil, 1 tablespoon butter
Add the chopped celery, onion and carrots to the pot, along with a few pinched of salt and pepper. Cook til softened, around 15 minutes.
6 celery stalks, 1 large onion, or two small, 2 large carrots, salt and pepper to taste
Stir in the minced garlic and cook for an additional minute or two.
4 garlic cloves
Pour in the stock and bring to a boil.
4 cups stock
Allow to simmer for 15 minutes, then take off of the heat.
Let cool a little and then pour in the half and half and stir to combine.
2 cups half and half
Blend the soup with an immersion blender or carefully in a stand blender.
Stir in the fresh dill and parsley and taste to season with salt and pepper.
1 tablespoon fresh dill, 4 tablespoons fresh parsley