Meanwhile, in a very large nonstick skillet over medium-high heat, heat 1 tablespoon oil. Add garlic and sauté until softened, about 3 minutes. Add another 1 tablespoon oil, along with sliced fennel and carrots. Reduce heat to medium and cook, stirring often, until vegetables are crisp-tender and browned, 10–12 minutes. Remove skillet from heat, and add wine and fennel seed. Return to heat, and cook until almost all the liquid has evaporated and tomatoes are tender, about 5 minutes. Stir in 2 tablespoons lemon juice, lemon peel, Italian herbs, salt and pepper. Remove from heat, and add spinach leaves; toss until spinach is slightly wilted.