White Bean, Bacon and Spinach Soup

small heads garlic

olive oil

sea salt and fresh black pepper

slices bacon (I used thick-cut)

yellow onion, diced

carrot, diced

celery, diced

garlic, minced

dried rosemary or basil

crushed red pepper flakes

low-sodium chicken broth

diced tomatoes

parmesan cheese rinds, optional

cooked white beans or 2 (14 ounce) cans, drained and rinsed (I used cannellini)

fresh baby spinach leaves, stems removed

fresh grated parmesan cheese, for serving