Cauliflower
Cauliflower is a pale brassica with a compact head of florets. It has a mild flavor and can be roasted, steamed, mashed, riced, fried, or baked into casseroles.
Identity
Mild brassica
A mild vegetable that takes well to sauces and spices.
Cut cauliflower into even florets so it cooks at the same rate. It can stand in for broccoli when a recipe wants a similar shape with a milder flavor.
Wikimedia Commons
Reference image
Cauliflower reference image.

Source: Wikimedia Commons
Used In Recipes
Substitutions
Acceptable
Broccoli -> Cauliflower
1 bunch of broccoli or 1 small head of cauliflower (about 1 pound), florets removed and sliced into small, bite-sized pieces
The source lists this as an alternative in the same ingredient row.
Source: Veggie Black Bean Enchiladas