This recipe originally used roast duck like in the pictures here, but you can substitute with roast chicken or turkey easily. The fruit used in the curry is pineapple, which can be substituted with all kind of fruits: apple, pear, kiwi or any canned tropical fruits: lychee, rambutan even the canned pineapple. The tomatoes are used to give it the umami taste. I never substitute them with anything else, and canned tomatoes are fine.