Powerball winner Edwin Castro was spotted taking a mystery woman out in a posh area of Los Angeles on Saturday in his green $90,000 vintage Porsche, RadarOnline.com has learned. Castro and the woman were seen at Sushi Park, a celebrity hotspot where dinner averages $400 per person. Castro cleaned up nicely in dark denim, leather dress shoes, and a button-down shirt. He puffed on a vape while walking alongside the blonde, who wore a black blazer draped over her shoulders, a matching satin black dress, and green stilettos. After they dined at the upscale sushi restaurant, the pair drove away in …