The restaurant owner beat rival Kate Walsh, 27, in the final task to create a new box of chocolates.
Sir Alan Sugar, 62, felt Yasmina, 27, had more business instinct.
'I can't believe it, I am in shock,' she tells the BBC. 'All those months ago you first apply to try to get on, and here I am, it's amazing.
'I don't feel like I've beaten Kate because I feel we both deserved that job, and we feel we just had different qualities and Sir Alan needed my qualities over hers.'
Yasmina will now work for Sir Alan's digital signage company.
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