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Grease a 24cm loose bottom tart tin and set aside.
Mix all pastry ingredients together.
Knead by hand to form a dough, adding a few drops of ice water if needed.
Roll out on a lightly floured surface, then line the base and sides of the tart tin, trimming away any excess dough.
Refrigerate for at least 2 hours or until ready to use.
Heat 2 tbsp of olive oil in a frying pan over a low heat.
Cook the onions and Robertsons Chicken Spice gently, stirring occasionally, for 20 to 25 minutes or until soft, sticky and caramelised. Leave to cool for 10 minutes.
Mix the egg, cheese and onion together and spread over the base of the tart.
Using a mandolin or a very sharp knife, cut the patty pans, sweet potato and butternut into thin slices.
Starting on the outside, arrange the vegetables into concentric circles with the rounded edges facing up.
Brush the vegetables with the remaining olive oil and sprinkle with the Robertsons Italian Herbs.
Place the tin on a baking tray and bake in a 180º C oven for 60 minutes or until the tart is golden brown and the vegetables cooked through.
Serve with crisp watercress.