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Step 1
Preheat your oven to 190°C (fan). Roll out the pastry and line a greased tart tin. Chill for 15 minutes, then blind bake for 15 mins using baking beans. Remove and set aside.
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Step 2
Boil the diced potatoes for 10 minutes until just tender. Drain and set aside.
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Step 3
In a large pan, melt the butter and gently sauté the leek, onion, and garlic until soft – about 8–10 mins. Stir in the thyme, potatoes and mustard.
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Step 4
Beat the eggs and then pour in the double cream, and fold through the grated cheddar. Season well.
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Step 5
Spoon the veg first and then the cheesy custard filling into the pastry case and bake for 20 minutes.
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Step 6
Remove from the oven, scatter with a little more grated cheddar, and return for another 10–15 minutes until golden and bubbling.
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Step 7
Cool before slicing. Garnish with chopped chives and serve with greens from the garden.