Preheat the oven to 250 degrees. Scatter the panettone cubes on a baking sheet and bake, tossing occasionally, until crisp and brown, about 1 hour. Be careful that they do not burn. Set aside. Put the cherries, apricots, and raisins in a medium bowl. Measure the honey and vinegar into a small pan or microwave safe bowl. Heat together just until warm. Whisk in 4 tablespoons olive oil and taste for balance. Add the remaining 1 tablespoon oil, if necessary. Pour over the dried fruits. Add the pear, fennel, and salt and pepper to taste. Pour the fruits and dressing over the greens in a salad bowl and toss well. Add the croutons and toss again. Serve immediately.