Cut the top ¼ inch off of each pepper. Remove the inner core and seeds.
Place the peppers on a baking sheet and put them into the oven for 25 minutes. Work around the stem on the top piece of each red pepper and dice.
Add 1 tablespoon of oil to a large frying pan. Add the fennel seeds and stir to toast them for one minute. Then add the diced red pepper, shallots, mushrooms, 3 cloves of garlic, sun-dried tomatoes, ½ teaspoon salt, pepper, and broth. Sauté for 10 minutes on medium heat. Add the garbanzo beans, and cooked farro and warm through for about 5 minutes then fill each of the peppers with the mixture.
To make the pesto, add the remaining garlic clove, basil, sunflower seeds, lemon zest, lemon juice, 2 tablespoons of olive oil, and ½ teaspoon salt to a blender. Blend until smooth.
Top the peppers with dollops of pesto and garnish with fresh basil Parmesan if desired. The stuffed peppers are ready to serve.