LOL! NICKI LIKE STEAK SAUCE ON HER MEAT!

Nicki Minaj committed the ULTIMATE steakhouse sin at Boa last night ... she sent someone out to get her A.1. Steak Sauce right in the middle of her meal!

FYI -- most chefs working at top steak joints across the globe consider a request for A.1. sauce (or any other sauce not made by the restaurant) as a total insult ... an insult proudly committed by millions of people every day. It's right up there with asking for your steak cooked "extra well-done and butterflied."

But last night in Hollywood, Nicki proved she doesn't give a damn ... 'cause after she sat down, TMZ cameras captured someone running in a bottle of A.1., specifically for Nicki's table.

On her way out of the restaurant, Nicki told us it wasn't just a one-time thing -- she ALWAYS puts A1 on her meat

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