My God, that guy sounds too good to be true TG.
*IF* he really pans out to be a Samaritan and not a con man you should grab hold of him with both hands! Investment partners like that are as rare as hen's teeth. Your typical investor demands only gobs of reporting, oversight and regular profit checks if you are lucky, and meddles with your daily operation too if you are not.
If cooking is your passion and you aren't afraid of working 80 hours a week for the next ten years then get your ducks in a row, have a lawyer draw up some papers and go for it. Just don't get overly excited about having a large chunk of capital - you'll soon see that $50K can disappear all too quickly.