In large bowl mix first 5 ingredients.
Stir in steak and onion cut into 8 wedges.
Let stand 15 minutes, then put on skewers and broil or grill until cooked. Reserve marinade.
In small saucepan over medium heat, bring reserved marinade to boil.
Whisk in peanut butter and 1/3 cup water.
Heat through and serve sauce on side to dip.
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