Croque madame-traybake

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1. 1
   To make the sauce, heat the milk in a saucepan with the onion, cloves and bay leaf. When boiling, turn off the heat and leave to infuse for 30 mins, then strain.
2. 2
   Melt the butter in another pan and add the flour. Cook for 4-5 mins until sandy. Gradually whisk in the milk, then cook over a medium heat, stirring, until you have a thick sauce. Stir in the mustard and season. Set aside to cool. Can be made up to two days ahead.
3. 3
   Heat oven to 180C/160C fan/gas 4. Butter a baking tray large enough to fit 3 slices of bread, then butter and toast the bread, and make 3 sandwiches with 2 slices of ham and cheese in each. Spread the white sauce on top, and make a small well in the sauce on each sandwich. Crack the eggs into the wells, then scatter over the parmesan. Bake for 20 mins or until the whites are just set.