Italian White Bean, Spinach and Beef Soup

Bahan-bahan (4 porsi)

• 1 lb ground beef
• 1/2 large yellow onion (diced into 1/2" pieces)
• 4 large garlic cloves (minced)
• 4 cups chicken stock
• Crushed sea salt or kosher salt
• freshly ground black pepper
• 1/2 teaspoon dried crushed rosemary
• 1/2 teaspoon dried thyme
• 1 1/2 cups cooked white cannellini or great northern beans (or 1 can of beans)
• 10 ounces fresh spinach (washed and stems removed, but save the the stems for smoothies)
• Pecorino Romano cheese (finely grated for topping)