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1
Grate the cheese on the small hole of the cheese grater.
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2
Put two tablespoons of it aside and mix the rest with enough cream or yogurt to make a thick paste (the leftover cream or yogurt will go in the sauce).
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3
Add some salt and pepper as well.
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4
Cut the crusts off the bread and spread each slice generously with the paste.
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5
Put a slice of ham, trimmed to fit, on half the sandwiches.
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6
Press together, particularly the edges, and cut each one in half diagonally.
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7
Now make the sauce by melting one tablespoon of butter in a small saucepan.
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8
Stir in the flour and gradually add the milk, stirring constantly to avoid lumps.
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9
Bring to a boil, then turn down the heat and cook at a gentle simmer for several minutes.
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10
Stir in the reserved cream or yogurt, the mustard and the cheese.
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11
Cook until melted and smooth.
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12
To cook the sandwiches, heat half the butter and oil until it is very hot.
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13
Fry half the sandwiches for a couple minutes on each side until golden and crisp.
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14
Drain on absorbent paper, while frying the rest of the batch.
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15
Serve with a knife and fork and a bit of sauce on the side, to drizzle over individually.
