For the meatballs: Preheat the oven to 400 degrees F. In a bowl, combine the bread and the milk and work with your hands until the mixture is a wet paste. Add the ground chicken, sausage, Parmesan, onion, tomato sauce, garlic, oregano, rosemary and eggs, and mix well. Make a test patty, cook and taste. Sprinkle the mixture with salt and pepper. Form 1-ounce meatballs and arrange on a sheet tray. Cook until the meatballs are completely cooked through, 15 to 20 minutes.
For the matzo balls: In a bowl, combine the schmaltz and the eggs. Add the matzo meal, baking powder and salt, and mix well. Mix in 1/4 cup of the chicken broth and mix well. Cover and refrigerate until the mixture has set, least 1 hour.
Form 12 to 16 balls out of the mix. Bring the remaining gallon of chicken broth to a simmer and drop the matzo balls in. Simmer until cooked through, 30 minutes.
For the minestrone: In a pot, heat the oil. Add the carrots, celery and onions, and sweat. Add the garlic and thyme and saute for 1 minute. Add the zucchini and saute until the carrots are just tender. Add the stock, beans and tomatoes, and bring the soup to a boil. Reduce the heat to a simmer and cook the soup until all of the vegetables are tender, 30 to 40 minutes. Season with salt and pepper.
For the pesto: In a food processor combine the basil, pine nuts, Parmesan, lemon juice, salt and garlic. Run the food processor, slowly add the oil and puree to a chunky paste. Season with salt and pepper.
To serve, bring the soup to a simmer and add the meatballs and matzo balls. Ladle the soup, 2 meatballs and 1 matzo ball in each bowl.
Spread some pesto on the crostini and balance on top of the matzo ball.