Chinese Szechuan Beef

Ingredients

• 1 1/2 Pounds Beef Tenderloin, cut into 1/2" cubes
• 1 1/4 Teaspoons Fine Ground Szechuan Peppercorns , divided
• 2 Tablespoons Oyster Sauce
• 1 Tablespoon Chinese Rice Wine, or Shaoxing wine or dry sherry
• 2 Teaspoons Potato Starch
• 2 Teaspoons Soy Sauce
• 1 Teaspoon Sesame Oil
• 1 1/2 Tablespoons Vegetable Oil
• 2 Cloves Of Garlic, thinly sliced
• 1 Small Green Bell Pepper, cut into 1/2" squares
• 1 White Onion, cut into 1/2" squares