Rosemary, shallots and garlic add bold flavors to this lentil side dish.
Put lentils, shallots, garlic, rosemary, and bay leaf in a medium saucepan; cover with cold water by 2 inches (about 5 cups water). Bring to a boil. Reduce heat to medium-low. Partially cover, and simmer, stirring occasionally, until lentils are tender, about 20 minutes.
Drain; discard garlic, rosemary stem, and bay leaf. Return lentil mixture to pan. Stir in salt, vinegar, and oil; season with pepper. Cover to keep warm until ready to serve.