Peel the Argentine red shrimps, cut into small pieces and set aside. Cook the heads and skins in water for 5 minutes.
Once cooked, strain and keep 250ml of the water. Leave to cool.
In a bowl, mix the flours and the reserved water.
Add the Argentine red shrimps, spring onion, parsley and salt. Mix together.
Heat plenty of olive oil in a frying pan and fry the mixture forming tortillas.
For the garnish, mix in a bowl the julienned onion, oregano, salt and citrus juice.
For the sauce, beat the avocado, Greek yogurt, salt and emulsify with olive oil. Serve and ready!