Preheat oven to 400ºF. Place carrots on a baking sheet and toss with 1 tsp. of vegetable oil. Add salt and pepper to taste.
Roast carrots, turning half way through cooking, until starting to brown and soften (about 20 minutes).
Do the same with the pumpkin and onions. Pumpkim and onions will cook in about 15 minutes.
While the vegetables are roasting, bring a large pot of salted water to a boil. Cook the penne according to package directions. Drain and reserve.
Place a small sauté pan over medium heat. Add the honey and garlic and cook until the garlic starts to caramelize (about 1 minute). Remove from heat and stir in the lemon juice and olive oil.
Place the carrots, pumpkin, onion, radicchio, penne, and parsley in a bowl. Stir in the warm honey-garlic vinaigrette.
Season to taste with salt and pepper. Divide between 4 pasta bowls.