Soak the peas in water for 5-10 minutes until soft.
In a large saucepan, melt the butter over low heat. Saute the garlic until lightly browned and fragrant. Add the peas and saute for 3 minutes.
Add 720 ml water (3 cups) and simmer for a few minutes. Remove from heat.
Transfer the peas to a blender. Add the heavy cream and puree the mixture until creamy. Transfer back to the saucepan.
Add the remaining water and parmesan. Season with salt and pepper and simmer for 5 minutes or until the parmesan is melted.
Meanwhile, place the almond slices and the butter in a microwave-safe dish. Lightly toast the almonds in medium high power for 10 seconds.
Top the soup with the alfalfa and toasted almond slices. Sprinkle additional parmesan cheese before serving warm.