Mouse Melon Cucumber Seeds Heirloom Vegetable. This variety, which is also known as Mexican Gherkin, produces large numbers of grape sized fruit with a marbled skin that resemble tiny watermelons. Fruit has the same taste and crunch of a cucumber but with a refreshing burst of sour lemon. Native to Mexico and Latin America, the tiny fruits are known as "sandita" and are perfect for stir-fries, pickling, salsa, desserts or martinis. We suggest that this cucumber is best grown on a trellis or other structure to support the long vines and myriad of small cucumbers and to make picking much easier.