Start by heating your wok or large skillet over medium-high heat until it's hot and shimmering, about 2 minutes. This quick heat is essential for searing the radishes and keeping their crunch.
While the pan heats, thinly slice the radishes into 1/8-inch rounds to ensure they cook quickly and evenly. Mince the garlic cloves and set aside.
Add the vegetable oil to the hot pan, swirling it around to coat the surface evenly. When the oil starts to shimmer, add the minced garlic and cook for about 30 seconds until fragrant and lightly golden.
Toss in the sliced radishes and stir quickly to coat them evenly with the oil and garlic. Cook for 2-3 minutes, stirring constantly, until the radishes start to soften slightly and their edges turn translucent.
Increase the heat to high and add the soy sauce along with a teaspoon of sesame oil. Stir vigorously for about 30 seconds, ensuring the radishes are glossy and slightly blistered on the edges.
Check the texture—radishes should be tender but still have a satisfying crunch, with a vibrant color and smoky aroma. If they need more time, cook for another minute, stirring often.
Remove the pan from heat and transfer the radishes to a serving dish. Garnish with sliced green onions for a fresh, crisp finish.
Serve immediately while hot for the best crunch and flavor. Enjoy this lively, savory side that transforms humble radishes into a bright, flavorful dish.