Tuna Potato and Balsamic Onions baked with Cheese

Another attempt to get rid of the cans of tuna...

Ingredients:

• 600g potatoes - cut into large cubes
• 1 can of canned tuna - drained
  
• 1-2 tbs mayonnaise
• Salt
• Black pepper
• 1/4 cup + 1/2 cup (or more) cheese - grated
  

For the balsamic onions:

• 1 tbs olive oil
• 1 large onion - diced
• 2 tbs balsamic vinegar

Directions:

• Boil potatoes in water+salt until softened. Drain.
• For the balsamic onions, fry onions in olive oil under low heat until softened. Add balsamic vinegar and cook until syrupy. Leave aside for later use.
• Mix together potatoes, balsamic onions, tuna, 1/4 cup of cheese and mayonnaise.
• Add salt and pepper to taste.
• Place in a baking dish.
• Sprinkle on 1/2 cup of cheese (or more).
  
• Bake at 200ºC until cheese is melted/ browned.