Sweet 'n Sour Sirloin Stir-Fry with Ranch Mashed Potatoes – Rachael Ray

Ingredients

• 1 1/2 pound piece sirloin, 1-inch thick
• 2 pounds Idaho potatoes, peeled and cubed
• Salt
• 3 tablespoons vegetable, peanut or canola oil
• 2 large red bell peppers, seeded and sliced
• 1 large green bell pepper, seeded and sliced
• 1 bunch scallions, cut into 2-3-inch pieces on bias, greens and whites
• 2 cups shelled frozen edamame
• 3 tablespoons brown sugar
• 3 tablespoons soy sauce
• 1/4 cup yellow mustard
• 1/4 cup ketchup
• 2/3 cup buttermilk
• Freshly ground black pepper
• A few dashes hot sauce
• Handful fresh flat leaf parsley, chopped
• Handful fresh dill, chopped
• Handful fresh chives, chopped