Heat bacon fat in a skillet. Add onion, sage, and spices. Cook until onions are soft.
Stir in the ham and cook briefly. Cool to room temperature.
Combine the cooled ham mixture, cream cheese, Mountain Meadow Mild Cheddar, scallions, Henry’s Horseradish Mustard, and vinegar in a food processor. Pulse until it forms a spreadable texture.
Preheat oven to 400°F.
Brush bread slices with butter and sprinkle with salt. Cut into triangles and bake until golden (about 5 minutes).
Spread the ham mixture onto the toasted triangles and bake until browned in spots (about 10 minutes).