This is a great recipe for Vegetarians and using ready made pizza bases and a jar of sauce it's a speedy, healthy supper dish for four.
Preheat the oven to Gas 6, 200°C, fan 180°C.
Arrange the sweet potato in a greased baking tin and roast in the oven for about 40 minutes, until tender.
Place the pine nuts in a second tin and put in the oven for the last 10 minutes of the cooking time. Shake the tray after 5 minutes so they brown evenly. Take care not to let them burn.
Spread sauce on each pizza base and top with slices of onion. Divide the sweet potato between each one and return the pizzas to the oven for about 10 minutes or until the bases are cooked.
Place pizzas on warm plates and top each one with spinach leaves, fetta cheese and a sprinkling of pine nuts. Drizzle with a little olive oil and balsamic vinegar and serve at once.
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