• 1/4 tsp. freshly ground black pepper
• Pinch of red pepper flakes
For the meatballs: Place the bread pieces into the bowl of a food processor and drizzle with the milk. Let sit for a few minutes to allow the bread to absorb the milk. Add the chopped 1 onion and 2 minced garlic cloves to the bowl and pulse several times. The mixture should still have small chunks of onion. Add the kale and basil, and pulse another few times until the kale is minced. Transfer mixture to a large bowl. (Alternatively, soak the bread with the milk in a large bowl. Mash with a fork. Finely dice the onion, garlic, kale and basil and add to the bowl. Proceed with the recipe.)
Add the chicken, egg, cheese, 1/2 teaspoon salt and 1/4 teaspoon pepper to the large bowl and mix together lightly with your hands. Form into 24 balls, slightly smaller than a golf ball, and place on large tray. Keep covered and refrigerated until ready to use. (The meatballs can be frozen at this point. Once the meatballs are frozen solid, transfer to a freezer bag. They can be kept frozen for up to 3 months. )
For the sauce: Purée the canned tomatoes in a blender until smooth.