Syrup Monin Watermelon 700ml. No other fruit says summer like the thirst quenching watermelon. Although watermelons can now be found in the market throughout the year, the season for the watermelon fruit is in the summer when it is sweet and of the best quality. When using Monin Watermelon to flavour your beverages, you will add true summertime watermelon flavour, any time.