Zucchini flower pie

This is a recipe from Yotam Ottolenghi – (he calls it Corsican Pie with courgette flowers) I made this one using zucchini flowers, swiss chard and some kale from the garden. Ingredients •1/2 small red onion, thinly sliced (85g) •3 celery stalks with leaves, thinly sliced (220g) •8 large Swiss chard leaves, white stalks discarded, [more]