Sauté onion in 1 tablespoon olive oil. Add apple and maple syrup, then cook for about five minutes. Remove from heat.
Top bread with remaining olive oil. Broil until golden, watching carefully so they don't burn!
In a small bowl, stir together cherries, horseradish and blue cheese. Spoon on toasts. Sprinkle with chopped hazelnuts.
Adapted from an original recipe by Noble Pig