Bibimbap in Westminster
You need to head for Garden Grove. Westminster doesn't have much in the way of a Korean-American population. My recommendation would be Jang Mo Gip on GG Blvd., but honestly at least half the places in the food court at H-Mart on GG Blvd/Magnolia make it, most in a dolsot, and most at least better than average.
Jang Mo Gip
9711 Garden Grove Blvd, Garden Grove, CA 92844