Tuna Mornay Bake

• 1 tbsp extra virgin olive oil
• 1 brown onion, diced
• 2 celery sticks, diced
• 1 carrot, diced
• 1 zucchini, thinly sliced
• 200 g green beans, ends removed and halved.
• 2 tbsp plain flour
• 500 ml milk
• 425 g tuna, in olive oil
• .5 cup parmesan
• 250 g brown rice microwave packet
• 100 g baby spinach