Clean and dry the squid thoroughly. Cut it into pieces according to your preference.
Slice large red chilis, bird's eye chilis, onion, turmeric, and garlic cloves.
Fry the squid in a pan without oil until the water has completely evaporated. Set aside when done.
In another pan, heat some oil and fry the sliced onions, chilis, turmeric, and garlic until they are fragrant and golden brown.
Add tempeh, oyster sauce, Thai chilli paste, and tamarind paste to the pan. Stir-fry for a few minutes until well combined.
Return the squid to the pan and stir gently for 1-2 minutes until heated through. If desired, add Hollandaise sauce slices and coriander leaves at this stage.
Adjust seasoning and serve hot.