Drain water from tuna cans to a bowl. reserve half a cup from it and discard the rest
Pond turmeric root, ginger garlic together, followed by yellow curry powder and black curry powder to make seasoning paste
Heat a skillet over medium and warm up the spices in oil add yogurt and saved water from the tuna can. Adding water from the tuna can is optional.
Slice curry leaves and green chili thinly and add to the oil. Sauté until color changes
Add yogurt black curry powder and give a good whisk. turn the heat off and leave on the stove to for a minute or two to warm the yogurt up and blend the flavors together.
gently mix the Tuna flakes in. Sprinkle cayenne pepper on top.
Slice onions and tomatoes thinly, lay down a bed of cabbage leaves / lettuce on a plate and place Tuna salad on the bed of cabbage. Enjoy !
Notes
This recipe equally good as a sandwich dressing instead of cheese or mayo in picnic lunches.