Combine the shells and body from one lobster and four cups of water to a medium saucepan. Bring to a boil, lower heat and simmer for fifteen minutes. Strain the liquid. You'll need 2 cups of broth for this recipe, you can discard or freeze the rest. Cook the bacon, butter, and onion in a large pan over low heat for 3 - 4 minutes or until the onions are soft and the bacon is cooked through but not crispy. Add lobster broth and cauliflower. Cover and simmer for 5 - 8 minutes or until the cauliflower is fork tender but not falling apart. Add the almond milk and heat gently for 2 - 3 minutes. Do not boil. Add the lobster and heat gently for another 3 minutes. Remove 1/2 cup of broth to a small bowl and whisk in the xanthan gum. Add it back to the chowder and stir until fully combined. Stir in the apple cider vinegar, Cointreau, parsley and 1 Tbsp butter. Continue stirring until the butter is melted and fully incorporated. Taste and adjust seasoning to your preference. Serve hot.