Mine is marinating in the refrigerator for tomorrow's dinner. I plan to put it in the oven. Is it true that it does not crisp up if cooked on 250 for 5 hours? For those whose turned out crispy in the oven--what exactly did you do?

Thanks in advance for some tips

P.S. I went the onions-in-cavity route. I also put the spice mix UNDER the skin as well as rubbed it all over the outside and in the cavity. I can't wait to see how that works!