Slow cooker beef and broccoli

Ingredients

• 2 tbsp vegetable oil
• 3 scallions, minced
• 2 tbsp fresh ginger, grated
• 3-4 garlic cloves, minced
• 2 tsp toasted sesame oil
• 1/4 tsp red pepper flakes
• 1/4 tsp dry mustard
• 1/2 cup chicken broth
• 2 tbsp soy sauce (or Tamari)
• 2 tbsp packed brown sugar
• 1 tbsp corn starch
• 2 lbs boneless beef chuck roast, trim fat and cut into 1 1/2 inch pieces
• 1 1/2 lbs broccoli florets, cut into 1 inch pieces
• 1/4 cup orange juice