Heat olive oil in a large skillet over medium heat. Add the ground meat and cook until browned. Stir in the chopped bell pepper and garlic, cooking until softened. Pour in the crushed tomatoes, oregano, thyme, fennel seeds, and red pepper flakes. Season with salt and pepper. Let the sauce simmer while you prepare the noodles and filling.
Bring a large pot of salted water to a boil. Add the lasagna noodles and cook according to package instructions until al dente. Drain and rinse with cold water to prevent sticking.
In a mixing bowl, combine the ricotta cheese, shredded fontina, basil pesto, and chopped sun-dried tomatoes. Season with salt and pepper to taste. Mix until well combined.
Spread a thin layer of the ricotta mixture onto each lasagna noodle. Roll up the noodles and place them seam-side down in the skillet with the simmering sauce. Repeat with the remaining noodles.
Cover the skillet with a lid or aluminum foil. Bake in a preheated oven at 375°F (190°C) for 20-25 minutes, or until the cheese is melted and bubbly. Remove the cover and bake for an additional 5 minutes to allow the top to brown slightly.