1.Using a serrated knife, cut the bread crossways into 24 slices.
2.Brush one side of each slice with butter; turn slices buttered-side down. Spread tops of all slices with mustard; sandwich pancetta and cheese between slices, keeping the buttered side on the outside.
3.Preheat a large sandwich press. Toast sandwiches for 5 minutes or until golden and cheese is melted.
4.Top with a cornichon, secure with a toothpick. Place on a platter to serve.
Substitute sliced prosciutto or ham for the pancetta, if you prefer. Sandwiches can be made 4 hours ahead: store, covered, in the fridge. Reheat on a baking-paper-lined oven tray in a 180°C/350°F oven for 6 minutes or until heated through.
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