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I've never had trouble making Tuna and Pineapple casserole before coming to Turkey. After making the white sauce and adding the cheese, tuna and fresh pineapple the whole mixture turns sour. No amount of adjusting with salt or sugar can save it. This has happened at least 3 times now. Could the cheese be making it sour or some other chemical reaction. I used to use canned pineapple in Australia but fresh is more readily available here. Could that cause the sourness because there is less sugar?

  • I am not sure if there are differences in canned pineapples between Germany and Australia... but at least the German ones are canned in syrup, and therefore MUCH sweeter that any fresh pineapple you may ever find. Considering that I would indeed suspect the pineapple. No full answer, though, because I usually only use canned ones as well, so my experience with fresh ones is severely lacking. – Layna Nov 4 '14 at 15:06
  • Completely speculation here but the heat treatment that tinned pineapple undergoes during the canning process denatures certain enzymes, maybe that might have something to do with it? – Stefano Nov 4 '14 at 15:40
  • This sounds like a CRAZY weird dish to me. I would never think to combine tuna and pineapple. Very cool. Definitely going to check this out. Thanks. – Preston Dec 4 '14 at 23:28
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Basic Nutrition

One cup of fresh pineapple chunks has 82 calories, 21.7 grams of carbohydrates, 2.3 grams of fiber and 16.3 grams of sugar. One cup of drained, canned pineapple chunks has 109 calories, 28.2 grams of carbs, 2.4 grams of fiber and 25.8 grams of sugar. The calories, carbs and sugar in canned pineapple are higher than in fresh pineapple because the canned fruit is typically packed in fruit juice.

I think that it is probably the pineapple affecting it. If you can buy pineapple juice, adding some of that may help the problem.

Livestrong.com

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Canned pineapple is often HEATED (mildly) when canned. Heating the pineapple prevents the souring. This idea is used in some other dishes as well.

  • 1
    Canning always involves heat. – Chris H Jan 30 '18 at 8:25

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