Meat
Since Indian cuisine is based on Ayurveda and the 6 tastes , we often have the addition of something sour or sweet in addition to spices. My date chutney also contains tamarind which is a sour legume, adding sour taste to meat and fish makes it more tender.
Vindaloo dishes are primarily for those who like it HOT, but most people think it's stupid when you can't taste the other spices, but only the chili. You can therefore make this dish with less hot chilies or small and very hot ones that are bought in "immigrant shops". Vinegar makes the meat more tender and contributes to an exciting flavor.
Hi! Today I'm in a fusion mood again, pork is on the wish list from the pod and something that is rarely used in northern India. You can indeed find dishes with pork in western India, or rather in beautiful Goa which is India's answer to the south. It was on the west/south coast that Vasco Da Gama set foot (and thought he had reached Australia!). Incidentally, it was the Portuguese who brought chili with them, I have heard. Thus the vindaalo strength arose.
Sandwiches are a good example of old-fashioned fusion food. With England as a colonial power, the natives learned to bake bread and biscuits for their new countrymen. Breakfast with stuffed prantha among Indians + loaf for the English = sandwich with filling. When the English were in India, they left behind several such habits.