Meatless Mondays Meatball Soup

Name: Meatless Mondays Meatball Soup
Ingredients: FOR THE MEATBALLS; 1 small yellow onion, diced (or 1/2 large); 2 cloves garlic, minced; Olive oil; 1/2 cup walnut pieces; Pinch cardamom; 10-12 large sage leaves, minced; 1/2 cup Panko (or your own breadcrumbs, or leftover quinoa, rice, or risotto; 15 ounce can garbanzo beans, drained & rinsed; Zest of 1 lemon (Meyer, if possible); 1 large egg; Sea or kosher salt & pepper; FOR THE SOUP; 1 head cauliflower divided into small florets; 24 ounces chicken or vegetable stock (your own is best, but a good organic one will do); 2 generous handfuls spinach, stems removed; Juice of 1 lemon (Meyer, if possible); Additional chicken stock if needed for consistency; Sea or kosher salt and pepper; Olive oil for garnish; Crumbled Feta cheese for garnish; Chopped fresh Italian parsley for garnish