Add the vegetable stock to a large skillet and bring to a boil. Add the frozen green beans. Reduce to a simmer and cook for 5-7 minutes, or until the beans are tender and the liquid has evaporated. If you have any excess liquid left in the skillet, drain it away.
While the beans are simmering, crush the garlic. Once the beans are cooked, move them to one side in the skillet. Add a generous tablespoon of butter to the empty half of the skillet. Add the ground almonds and crushed garlic. Stir to combine. Pan fry over a medium heat for 2-3 minutes, stirring constantly until the garlic is fragrant and the almonds are starting to brown.
Mix the ground almonds and garlic in with the green beans. Add the Italian seasoning, lemon zest, Parmesan, salt and pepper. Stir well to combine and heat through for a minute more, creating a golden crumb to coat the beans. If the pan feels a little dry, you can add a touch more butter or a splash of water. Serve the dish hot with your preferred Keto mains.