Cauliflower and Root Vegetable Soup

This was my own creation to serve three main purposes. 1: Use my new immersion blender. 2: Use my celery root bulb. 3: Have something yummy for dinner with enough for lunch tomorrow.

Cauliflower and Root Vegetable Soup
2 tbsp olive oil
2 onions chopped
1 shallot sliced
3 garlic cloves sliced
1 carrot peeled and sliced
3 large red potatoes peeled and sliced
1 small celery root peeled and sliced
1 head cauliflower sliced
1/2 cup vegetable broth
5 cups of water (more when needed to keep veggies covered)
Salt
Pepper
Red pepper flakes
Coriander

Sauté onions and shallot in olive oil until soft in large pot with high sides. Add garlic and sauté for a minute. Add sliced veggies, water, and spices. Bring to a boil and simmer uncovered for half hour. Turn off heat and purée with immersion blender in the cook pot.