Watermelon isn’t only thirst‑quenching; its high L‑citrulline and potassium content has been shown to trim systolic blood‑pressure numbers in adults after just a few weeks of regular intake. Red grapes contribute polyphenols such as resveratrol , linked in clinical studies to healthier cholesterol profiles and better vascular function. Tossed with bright lemon‑and‑lime zest and served icy‑cold, this two‑fruit salad becomes a hydrating, heart‑friendly dessert for the hottest days.