Carrots and other root veggies like squash or pumpkin go well with this pairing because they’re vegetables that have and complement some sweet components. Think about it. Sweet Potatoes are naturally sweet. Carrots go great with a Honey or Maple Glaze. Pumpkins thrive when cooked with sugar and all the holiday spices. So why does it work with an Old Fashioned? Because, like almost every cocktail, you need some form of sugar to balance it out.