Slow Cooker Mongolian Beef (Tender Takeout-Style Dinner)

Ingredients

• 1 1/2 lb (680 g) flank steak, thinly sliced across the grain
• 1/4 cup (32 g) cornstarch
• 1 tablespoon neutral oil
• 1/2 cup (120 ml) low-sodium soy sauce
• 1/2 cup (120 ml) water or low-sodium beef broth
• 1/3 cup (70 g) packed light brown sugar
• 2 tablespoons hoisin sauce
• 4 cloves garlic, minced
• 1 tablespoon fresh ginger, grated
• 1 tablespoon rice vinegar
• 1 teaspoon toasted sesame oil
• 1/4 teaspoon red pepper flakes, optional
• 1 cup (85 g) shredded carrots
• 3 green onions, thinly sliced
• 1 tablespoon sesame seeds
• Cooked white rice or noodles, optional