Preheat the oven to 400 degrees.
Place the carrots and parsnips on a half sheet pan. Drizzle with the olive oil, and sprinkle with rosemary, thyme, salt, and pepper. Toss well, so everything is fully coated. Taste a carrot and add additional salt or pepper if needed. Spread the veggies in a single layer across the baking sheet.
Place the carrots and parsnips in the oven and roast for 20 minutes, stirring halfway through.
Meanwhile, in a measuring cup, whisk together the butter, honey, and lemon juice. Take the veggies out of the oven and pour the butter mixture over them. Stir well, then put the pan back in the oven and roast another 10-15 minutes, until veggies are tender.
Stir the veggies well, and drizzle lightly with additional honey, if desired. Serve.