Buckwheat with Mushrooms

Bahan-bahan (4 porsi)

• 1 cup whole kernel brown buckwheat
• 1 Tbsp olive oil or canola oil
• 2 cups reduced sodium broth (I used reduced sodium "Better Than Bouillon" 2 tsp in 2 cups boiling water)
• 1/2 tsp salt (omit salt if using regular broth)
• 3 -4 mushrooms (sliced)
• 1/2 medium onion (finely diced)
• 1 Tbsp unsalted butter