Sticky & Spicy boneless beef ribs: Slow Cooker or Oven!

Ingredients

• 2.5 lbs (1.13 kg) boneless beef ribs, cut into 2-inch (5 cm) pieces
• 1 tbsp vegetable oil
• 1 large onion, chopped
• 2 cloves garlic, minced
• 1 inch (2.5 cm) piece of ginger, peeled and grated
• 1 cup (240 ml) ketchup
• 1/2 cup (120 ml) soy sauce (low sodium preferred)
• 1/4 cup (60 ml) brown sugar, packed
• 2 tbsp rice vinegar
• 1 tbsp Worcestershire sauce
• 1 tbsp sriracha (or more to taste)
• 1 tsp smoked paprika
• 1/2 tsp ground black pepper
• 1/4 cup (60 ml) water (or beef broth)
• 1 tbsp cornstarch (mixed with 2 tbsp cold water)
• Sesame seeds (optional)
• Chopped green onions (optional)