Very flavorful! One of my favorite flank steak recipes yet. There was definite heat, but not 'spicy' in the way my husband hates (the heat didn't stay in your mouth too long). Pretty simple to make, if you have the right ingredients.
Note: pretty sure the rice vinegar needs to be unseasoned because seasoned vinegar has sugar. I'm pretty sure high heat sugar caused my kitchen to smoke up. The steak was fine, thankfully, but now I guess I'll have to buy another rice vinegar.