Step 1

Preheat oven to 200C. Heat butter and olive oil in a frying pan over medium-high heat, add leek, silverbeet stalks and garlic and sauté until tender (2-3 minutes). Add silverbeet leaves, stir until wilted, then stir in rind and herbs, season to taste and set aside.

Step 2

Line a 23cm-diameter tart tin with pastry, trim edges, leaving a 1cm overhang. Whisk eggs in a bowl, stir in Gruyère and silverbeet mixture, spread in pastry case, crimp edges and bake until golden and set (15-20 minutes). Serve hot or at room temperature.