In a 6- to 8-inch frying pan over medium heat, combine salad oil and sesame seed. Shake pan often until seed is golden, 3 to 5 minutes. Add ginger, garlic, and chili. Stir, remove from heat, and let cool about 2 minutes.
Add rice vinegar, soy sauce, and sugar and stir to blend.
Pour dressing over beans and mix.