Seafood and vegetable stir-fry

Ingredients

• 12 oz raw jumbo shrimp
• 1 lb cod or sole
• 2 squid ((500 grams/1 lb in total))
• 2 tbsp canola oil
• 1cm piece fresh ginger (peeled and julienned)
• 2 garlic cloves (chopped)
• 2 1/2 oz broccoli florets
• 1 carrot (peeled and julienned)
• 2 scallions (roughly sliced)
• 1 cup water or salt-reduced or homemade chicken stock
• 2 tbsp oyster sauce
• 2 tsp salt-reduced soy sauce
• 2 tsp sugar
• 1 tbsp cornstarch