While the cassava is cooking, heat oil in a large saucepan at medium heat. Add garlic, onion, tomatoes, ají panca and ají amarillo. Cook for 5 minutes.
Add chicha de jora, stock and pisco (if using) to the saucepan. Place fish on top of vegetables and scallops on top of fish. Season with salt and pepper. Turn down heat to low, cover and cook for 10 minutes.
Drain cassava.
Serve sudado with boiled cassava and rice/cauliflower rice (if desired). Garnish with fresh chilli and coriander.