To cook liquids alone or a combination of ingredients with liquid just under the boiling point (180° to 200°). The surface of the liquid will have some movement and there may be small bubbles around the side of pan.
This is one of my favorite meal-in-a-bowl soups because it's very tasty with little preparation. Collard greens or chopped kale can be used instead of spinach. The hot pepper sauce adds real kick, but it's fine to leave it out and let each person flavor their own serving.