the proof of the pudding (is in the eating) | the proof is in the puddingidiomPart ofeatingthe proof of the pudding (is in the eating) | the proof is in the puddingthe proof of the pudding (is in the eating) | the proof is in the pudding — idiomidiom1. You can only know if something is good or bad after you try it yourself.1.idiomDefinitionYou can only know if something is good or bad after you try it yourself.ExampleMaya said her new recipe was delicious, but the proof is in the pudding.Don't just trust the advertisement; the proof of the pudding is in the eating.