Any spicy ingredient gives cold res. At this point you should have a handful of options to pick from. Just throw together any type of food with “spicy” in the name.
I just put five sunshrooms together and get a spicy mushroom skewer with max cold resistance. It lasts like 12 minutes, too, if I recall. You can find a bunch of sunshrooms in the woods east of the ranch with the sheep and cows in Hateno Village.
You're right, it did help,thanks! Got up there and freed the dragon finally " with a little help from my friends " lol. This forum is a great place, thank you all.