Preheat oven to 350 degrees F.
Pour maple syrup into a small bowl. Toss nuts in syrup, remove with a slotted spoon, and bake on aluminum foil or a cookie sheet for approximately 10 minutes, or until nuts are roasted and syrup solidifies around nuts.
In a large bowl, add beet, apple, fennel, mint, salt and pepper. Toss. Add oil and vinegar, stilton and nuts. Toss and serve immediately.