Heat olive oil in a 2–3 quart saucepan over medium heat. Add the orzo and red onion. Stir constantly until pasta is a golden color (5-7 minutes). Add the garlic and cook an additional minute.
Add the vegetable broth and salt. Bring to a boil and then reduce to a simmer over low heat. Cover and simmer for 10-15 minutes or until orzo is al dente and the liquid is absorbed. Add water if the broth is absorbed before the pasta is al dente. If pasta is cooked and liquid remains, cook uncovered until the liquid has been absorbed. Deglaze pan with vermouth.
Remove from heat. Add the lemon juice, parmesan, parsley, chives and capers.
Serve immediately, at room temperature or cold. To reheat, place in a 350-degree oven in a covered dish for 15 minutes.