Start by washing and thinly slicing the radishes into rounds or half-moons, about 2-3mm thick. Set aside for quick access.
Mince the garlic cloves finely, releasing that fragrant, pungent aroma as you prepare to cook.
Heat your wok or large skillet over medium-high heat until shimmering, then add the vegetable oil, swirling to coat the surface evenly.
Once hot, toss in the minced garlic. Cook for about 15-20 seconds until you smell a sweet, pungent aroma filling the air, but be careful not to let it burn.
Add the sliced radishes to the pan, spreading them out in an even layer. Sauté for 2-3 minutes, stirring quickly, until they start to turn translucent and edges develop a slight golden hue.
Pour in the soy sauce, then stir continuously, cooking for another 1-2 minutes until the radishes are tender but still maintain a crisp bite, with a glossy sheen.
Finish by drizzling the sesame oil over the radishes, tossing to coat evenly. The dish should smell toasted and nutty, and the radishes should remain juicy and crisp.
Remove from heat and transfer to a serving plate. Garnish with sliced scallions or a sprinkle of sesame seeds if desired for added crunch and aroma.
Serve hot, ideally with rice or noodles, and enjoy the lively, peppery bite of this simple yet flavorful radish stir fry.