Containing apples or apple-flavored; made or prepared with apples.
Apple + -ed (adjective suffix). Similar to how 'salted' means containing salt or 'wooded' means containing woods, 'appled' describes something that includes apples.
You might find 'appled pie' or 'appled sauce' in older cookbooks or menus, but English speakers prefer just 'apple pie' and 'applesauce' now—sometimes simpler wins out even when the -ed form is technically grammatical.
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