Proposal Reminder @Hervé

To celebrate Thursday, here's a riddle.

You have 3 crates, all labelled incorrectly.

One crate says "apples". Another says "oranges". The third says "apples and oranges". For anyone unclear, we've included a visual representation.

Your task is to reach into one crate, take one piece of fruit and from there, correctly work out how each crate should be labelled.

How do you do it?

Rules: no 'feeling around' and no looking into crates. You only have one shot, one opportunity, mom's spaghetti.