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.