Saute onions in the butter in a large soup pot over high heat, stirring occasionally to prevent onions from sticking until they begin to soften about 10 minutes. Add garlic, lower the heat to medium and continue cooking for another 10 minutes until onions are translucent. Stir in spinach and saute until wilted about 5 minutes more. Add peas and the stock to the pot and bring to a boil over high heat. Lower the heat and simmer, uncovered, for 10 minutes. Remove soup from heat and allow to cool for a few minutes.
Using a food processor puree soup in small batches (use a second bowl to pour puree in until all soup is pureed). Place puree back into pot, add cream and bring to simmer over low heat.
To serve, ladle soup into 4 large bowls and top with about 3 tablespoons of the fresh mint cream.
In a bowl, using a whisk, combine all ingredients until smooth.
This recipe was created by a contestant during a cooking competition. It has not been tested for home use.