In a bowl combine vinegar, Dijon, salt and pepper. Whisk in walnut oil and 8 tablespoons canola oil. Set aside.
In a skillet, heat 1 tablespoon canola oil. Toss walnuts in hot skillet until toasted. Transfer to a small bowl.
In the same skillet, heat beet greens until warm. Transfer to plate. Drizzle with dressing. Garnish with chunks of Stilton and toasted walnuts.