How to Make It
Heat the bacon fat in a large, heavy skillet. Add the chopped onion and sage leaves, cloves and cayenne and cook over moderate heat, stirring occasionally, until the onion is softened but not browned, 6 to 8 minutes. Add the ham and cook, stirring occasionally, for 2 minutes. Remove the skillet from the heat and let the ham mixture cool to room temperature.
In a food processor, combine the ham mixture with the cream cheese, shredded cheddar cheese, sliced scallions, Dijon mustard and apple cider vinegar and pulse until the mixture resembles the texture of a rustic country pâté.
Preheat the oven to 400°. Brush the bread slices with the melted butter and sprinkle with salt. Using a sharp knife, cut each slice of bread into 4 triangles. Transfer the bread triangles to a baking sheet and bake for about 5 minutes, until golden.
Spread some of the spiced ham mixture on each toast triangle and bake for about 10 minutes, until browned in spots. Garnish the ham-and-cheese toasts with the julienned scallions and serve right away.