In a large pot over medium heat, heat 2 tablespoons of olive oil. Add the onion and cook for 2 to 3 minutes, or until it starts to soften. Add the ginger, fleur de sel and apples and cook for additional 2 minutes.
Add the stock and bring to a boil. Once boiling, add the peas and let the mixture boil for 2 to 3 minutes, after which you should reduce the heat and let the soup simmer for 10 minutes, or until the peas and apples are cooked.
Remove the pot from the stove. Transfer the soup to a food processor (you can also use an hand blender) and process for 2 minutes or until the soup is creamy and totally smooth. Serve immediately, garnished with a few mint leaves and a couple tablespoons of oat cream, if desired.