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4 oz (125 g) cold butter cut into cubes |
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2 – 3 tablespoons cold water |
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3 – 4 white potatoes, peeled and cut into very thin slices |
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2 medium size leeks, white and light green part, sliced thinly |
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1 lb (½ k) spinach leaves, without stems |
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1 cup cheddar cheese or similar, shredded |