In a new adventure with my imperialistic Britisch Empire i decided I wanted acces to the COT of Bruhir? Not sure if its the correct name, its the land around the ganges delta, into tibet. As they were allied with another country that I bribed to get into their CoT, I looked for a way to draw em into a war without angering my semi friendly nabour on sumatra. Declaring war on a minor india nation solved this problem, although it did drag in the largest indian nation and another nation I havent even met yet.
So far so good. My expeditionary force is only 10k strong with a subpar general, but Bruhir is throwing their forces at me piece by piece as the mindless savages they are (joking ofc,

). The India minor and Bruhir are under Naval lockdown and the india major seems to be so busy fighting rebellions that their army count is marginal in this alliance. The entire alliance outnumbers me 5 to 1 but so far I am not too worried.
Now my question though: How do I demand Bruhir to open their CoT to me? I do not see the option in the demand tribute list. The game itsself says I can open a CoT by both warfare and diplomacy, but I can't find it. The war is nowhere far enough progressed for me to demand anything, (4%+) but I find it strange I don't even see the option.
Then another question do spices become more valuable over time? ceylon and sumatra all produce this and historicly it was highly sought after, but so far the prize is 3 or something.