Heat oil in a pan and add sliced leek.
Season with salt and pepper, add garlic, and sauté for a few minutes until soft.
Add broth, mustard, and lemon juice, and cook for a few minutes.
Stir in cream and butter beans, and simmer briefly.
Add almond flour if needed to thicken the sauce.
Sprinkle with parsley and parmesan, and serve.
Cook it hands-free.
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