Green Baked Eggs with Broccolini, Leek, Baby Spinach and Feta
1 Tbsp extra virgin olive oil25g unsalted butter1 leek, thinly slicedSea salt1/2 tsp white wine vinegar, or a dash of fresh lemon juice100g broccolini, florets left whole and the stalk sliced diagonally into 1cm pieces65g (1 big handful) baby spinach...