Spanish Chickpea and Chorizo Soup

olive oil, for sauteing

fresh chorizo sausage links

large yellow or Spanish onion, finely chopped

stalk celery, finely chopped

garlic, minced

big sweet potatoes, peeled and cubed

chickpeas, drained and rinsed

chicken broth

petite diced tomatoes

packed cups baby spinach,stems removed

coarse salt and fresh ground black pepper

extra virgin olive oil, for serving

hard-boiled eggs, grated on the large side of a box grater, for serving

pata negra, Spanish ham, prosciutto or cooked bacon, finely chopped