To prepare freezer pack: Combine lentils, onions, carrots, garlic, coriander, bay leaves, cumin, oregano, pepper and cayenne in a sealable plastic bag. Seal and freeze for up to 6 months.
To prepare soup: Empty the freezer bag into a 6-quart slow-cooker. Add broth. Cover and cook on High for 4 hours or Low for 8 hours.
Discard bay leaves. Transfer half of the soup to a blender and puree. (Use caution when blending hot liquids.) Return the pureed soup to the slow cooker and stir in spinach, tomatoes, coconut milk, parsley, vinegar and salt; heat through.
