INGREDIENTS
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For the tart case you will need (10" loose bottomed flan tin)
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200 gms / 7oz plain flour
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60gms/2oz Butter
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60gms/2oz Vegetable Shortening (Trex)
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pinch of salt
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2-3 tbsp ice cold water to bind
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For the Filling
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2 largish potatoes, very thinly sliced and boiled in salted water for 3 minutes then refreshed in cold water
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3 large onions peeled & thinly sliced
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25gms/1oz butter
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250gms/9oz cheddar cheese grated
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2 tsps Dijon mustard
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plus a little extra finely grated to sprinkle over the potatoes
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around 1tbsp fresh Thyme leaves or just 1 tsp if using dried
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a little white pepper sprinkled between each layer of filling
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you shouldn't need any salt at all
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a little melted butter to brush over the potatoes