On March 1, Southern cuisine comes to Boston's South End — courtesy of Southern Proper, a celebrated local chef's return to his culinary roots. Though it inhabits the ground floor of the Girard, a new luxury apartment building, there's a down-home feel to this delightful newcomer, where the rustic-refined spins on comfort eats, clever cocktails and laid-back vibe come together to create some genuine-feeling Southern hospitality. Here's what to know before you mosey on over.