Vietnamese-Style Sautéed Beef | Saveur

Ingredients

• 1 lb. beef tenderloin, trimmed and cut into 1" cubes
• 6 tbsp. canola oil
• 7 tsp. sugar
• 4 tsp. freshly ground black pepper
• Kosher salt, to taste
• 1 bunch watercress, for garnish
• ¹⁄₄ cup rice vinegar
• ¹⁄₄ cup soy sauce
• 1 tbsp. fish sauce
• Juice of 2 limes
• 3 scallions, cut to 1" lengths
• 2 cloves garlic, finely chopped
• 1 medium red onion, thinly sliced
• 1 tbsp. unsalted butter