Chicken Lemon Rice Soup

butter

medium carrots (sliced thin)

sweet onion (diced)

boneless, skinless chicken breasts (cut into bite-sized pieces)

garlic (minced or crushed)

chicken broth

water

lemons

instant brown rice ((see note))

baby spinach (roughly chopped)

freshly ground black pepper

salt (to taste)

Sriracha sauce (optional)