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If you have a grill, this is the easiest burger you can make! Serve with a light salad, such as Dill & Cabbage Salad. (*Indicates Potomac Vegetable Farm (PVF) produce and ** Star Hollow Farm produce. For more information about what we are doing with our PVF CSA share, click here.)


  • 3 tbsp extra virgin olive oil
  • 2 tbsp balsamic vinegar
  • 1/4 tsp salt
  • 1/4 tsp pepper
  • 4 large portobello mushrooms**, remove stems
  • 1 large onion, thickly sliced into 1/2 inch slices
  • 4 leaves of lettuce*
  • 4 small, high quality buns
  • Slices of cheddar cheese (optional)


  1. Combine oil through pepper in a small bowl. Mix well. Using a brush, evenly coat each portobello mushroom and onion slice with oil vinegar mixture (you may need to mix more, depending on the size of your onion and mushrooms).
  2. Grill portobello mushrooms for 12-15 minutes (about 6 minutes on each side) and onions for 8-12 minutes (about 4 minutes on each side), or until cooked through.
  3. Serve 1 grilled portobello mushroom and 1 grilled onion slice on small, high quality buns topped with dijon mustard, mayo, cheddar cheese, and lettuce.