The best replacement for capers is caper berries.

The best alternatives to capers are rated as following:
★★★★★  caper berries

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Speaking about capers, one probably shouldn't forget about salmon.

Other search terms related to capers and their ratings are:

★★★★★ salmon
★★ chicken
salmon pasta
You have in mind a companion for capers and it is not yet here? Propose!

Google Trends

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caper berries