Heat oil in a large, nonstick skillet over medium heat. Add asparagus and stir-fry until it begins to soften, 1 1/2 to 2 minutes.Advertisement
Add soy sauce and stir-fry for 1 minute. Add sugar and stir-fry another 30 seconds. Remove from heat and serve.
People with celiac disease or gluten-sensitivity should use soy sauces that are labeled "gluten-free," as soy sauce may contain wheat or other gluten-containing sweeteners and flavors.