Chop the onion, carrot, and broccoli finely. Drain the tuna and prepare it. Boil the broccoli before chopping.

Soak the onion rings in water briefly to reduce their sharp taste.

Combine tuna, broccoli, carrot, onion, and egg in a bowl. Add salt if preferred.

Add 2 tbsp of pancake mix to the mixture and adjust the consistency as needed.

Mix all the ingredients thoroughly until well combined.

Heat a pan and add cooking oil. Place the onion rings on the pan.

Fill the onion rings with the prepared mixture.

Cook until golden brown on both sides. Adjust the heat to low as they cook through.