Fall is around the corner here and I can not wait to give this a go!
Olive oil does the heaviest lifting in this pot. Sautéing onions, carrots, celery, and garlic for a full 15 minutes over medium-high heat builds foundational depth. Do not rush this stage. Pale vegetables yield flat broth. Wait until edges turn deeply golden before adding liquids.
Extracting two cups of solids for blending alters the body of the pot without adding heavy cream. A standard countertop blender handles this easily, but let steam escape through the lid vent to prevent pressure explosions. Pulse until completely smooth, then stir the puree back in. If the result measures too thick, adjust consistency with warm vegetable broth added in quarter-cup increments.
Finish bowls with a precise dash of balsamic vinegar to sharpen the earthy legume flavor. Dried lentils absorb liquid continuously as the pot cools. Store leftovers in airtight glass containers for up to four days. Reheat individual portions on the stove over medium-low heat, thinning with water as needed.