How to Make It
Heat oil in a small saucepan over medium; add onion, caraway seeds, and garlic. Cook, stirring often, until tender, about 4 minutes.
Stir in beer, beef consommé, and pepper. Bring mixture to a boil, stirring occasionally; reduce heat to medium-low, and simmer until reduced to 1 cup, about 10 minutes.
Stir together cornstarch and water in a small bowl until smooth; add to beer mixture.
Cook over medium, stirring constantly, until mixture boils and begins to thicken. Boil, stirring constantly, until thickened and glossy, 1 minute.