"Do your own research.

A hint. It's different in different places, and at different times, but a spit-roast analogue has some value... "

Or perhaps a spit-roast in a vacuum.
Much of traditional cooking involves heat being transferred by convection and conduction. If the heat source is not below the object being heated, but if instead the heat source is above or from the side then there might less heat transferred from convection involved.

In terms of our understanding temperatures on Mercury the most significant factor is it's near vacuum, followed by it's close proximity to the sun {Mercury has about 6 1/2 times more solar energy per sq meter as compared to Earth distance}. Mercury is more similar to our moon than it is to Venus.

Mercury's daytime is long ["58.65 Earth days"- http://www.enchantedlearning.com/subjects/astronomy/planets/mercury/ ].
In terms of the length of the day, this probably doesn't make much difference in terms of how hot it is on Mercury.
58.65 times 24 equals 1407.6 hours, so 300 hours into the day isn't going to significantly warmer than at the 100th hour of the day. Though there will differences due to the sun's angle and sun's distance throughout the Mercury's day.
Mercury has a highly eccentric orbit ["0.205 "- http://nssdc.gsfc.nasa.gov/planetary/factsheet/] the only planet with higher orbital eccentricity is Pluto. And each Mercury day is most of a Mercury year.
This could mean that "noon time temperatures" on Mercury could be less or could be significantly warmer if these "noon time temperatures" occur at same times as when Mercury is nearest the Sun.