Sweet n Sour Sirloin Stir-Fry with Ranch Mashed Potatoes

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1 1/2 pound piece sirloin, 1-inch thick

Handful fresh dill, chopped

Handful fresh chives, chopped

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 to 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