In a large soup pot, heat the oil over medium heat. Add the onion, carrots, and garlic. Season the vegetables with salt, rosemary, black pepper, nutmeg, and ground ginger. Sauté until the onion is translucent and the vegetables are soft, about 5 to 7 minutes.
2 tablespoons olive oil, 1 small yellow onion, 2 medium carrots, 2 large garlic cloves, 1 teaspoon kosher salt, 1/2 teaspoon dried rosemary, 1/4 teaspoon black pepper, 1/4 teaspoon ground nutmeg, pinch ground ginger