In a small saucepan, heat the vinegar and sugar over medium heat until sugar has dissolved. Set aside to cool. Peel and finely slice the shallots and place in a heat proof bowl. Pour the vinegar mixture over the shallots, season with salt and pepper. Stir to combine and set aside.
Preheat the oven, select auto cook menu 19, Frozen Breaded Products. Put the enamel tray on top of the wire rack. Place the fish fillets in a single layer onto of the wire rack. When the oven is ready, place in the oven, dial in 250g and press start. The oven will prompt you when to turn the fish over.
Whilst the fish is cooking, prepare your accompaniments. Dice the tomato and avocado. Combine the yoghurt sauce ingredients together in a bowl and season with salt and pepper.
Microwave the tortillas for 30 seconds. Drain the shallots.
To assemble, place a tortilla in your hand, top with some lettuce, one fish fillet, and top with some tomato, avocado, yoghurt sauce, pickled shallots and coriander leaves.