Instructions

  1. Remove roots, outer leaves, and tops from leeks, leaving 6 inches of each leek.
  2. Cut each diagonally into thirds, then diagonally in half to form 6 triangular pieces.
  3. Rinse under cold water; drain well.
  4. Combine beef broth, tomato paste, salt, thyme, and pepper in a bowl, and stir with a whisk.
  5. Melt butter in a large nonstick skillet over medium-high heat.
  6. Add leeks and mushrooms, and saute 6 minutes or until the vegetables are lightly browned.
  7. Add broth mixture.
  8. Cover, reduce heat, and simmer 15 minutes or until leeks are tender.
  9. Uncover, and simmer 7 minutes or until liquid almost evaporates, stirring occasionally.