For the quick sautéed cherries
For the rest
In a medium saucepan over low heat, combine cherries, lemon juice, and sugar. Smoosh cherries slightly with a fork to break them down. Cook, stirring occasionally, until cherries soften and liquid thickens and evaporates almost entirely, about 20 minutes. Allow to cool to room temperature before assembling parfaits.
Using a stand mixer or a hand mixer, whip heavy cream and sugar to soft peaks. Spoon layers of whipped cream, Belgian waffle pieces, and quick sautéed cherries into glasses, top with whole cherries, and serve!