Boil your lentils and carrots on medium heat until softened in the water and stock, also add your rosemary to this broth. If the carrots are cooked through first just remove these and leave aside
Once the lentils are boiled, blend with the remaining ingredients and enough liquid for your blender to get everything smooth. Keep your remaining liquid aside
Return to the stove and add more broth if needed until your desired consistency
Notes
Serve warm and garnish with more spring onion/olive oil/cream or garlic and parsley croutons (highly recommended)