Here is the meatball recipe I use most often. If you are more concerned with green veggies instead of orange ones I would probably not use this one - the sweet/sour type taste IMO would taste odd with green veggies. In that case I use my "regular" meatballs recipe - just ground beef, bread crumbs (I use GF cause I can't do gluten), egg, garlic, onion, kosher salt and pepper and tomato paste. To that I add finely chopped spinach and/or broccoli.
1 large egg, beaten
3 cloves garlic, minced
1/2 tsp ground ginger
1/4 cup sweet potato puree
1/4 cup carrot puree
2 Tbsp jam (I use all natural, no sugar added strawberry)
2 Tbsp ketchup
1/4 tsp salt
1/2 cup wheat germ
1/4 cup flaxmeal
1 pound ground beef
In a large bowl, whisk together egg, garlic, ginger, veggie purees, jam, ketchup, salt, wheat germ and flaxmeal. Add the ground meat and mix with your hands until well combined. Using damp hands, pinch off about 1 tbsp of meat and gently shape the mixture into small golf ball-sized meatballs.
Heat a skillet on medium with 1-2 tbsp olive oil to coat the bottom. Brown on all sides (takes about 5 minutes) and then finish baking in the oven at 350 for about 10-15 minutes.