Begin by making the coleslaw. In a bowl, whisk together the mayonnaise, mustard, vinegar and honey until well combined. Add the collard greens and green onions and fold into the dressing until well incorporated. Season to taste with salt and pepper and place in the fridge for at least 30 minutes to let the collard greens break down a little.Grill the hot dogs and the buns until grill marks appear and the hot dogs have been cooked all the way through. While the hot dogs are still warm, place in the buns and top with a few dollops of pimento cheese. If you want the pimento cheese to really melt, you can place it in a 350 degree oven for a few minutes. Top with the cold collard green slaw and serve immediately.