Heat a non-stick pan over a high heat. Once hot, add the butter and constantly stir. Once the butter starts to brown, reduce to a medium heat. Add the shallots and cook for 3 min. Add the garlic and fry for 1 min. Add the measured water, stock cube and spinach and simmer for 2 min. Remove from the heat. Add 1/1.5/2 Tbsp lemon juice.