When considering what is avante guard and   vanguard it is important to remember that  the world is very postmodern. Just as in movies and literature the only new innovations in my opinion can come from pastiche. remember that at one point (and maybe for some still now) 50's era cuisine was considered comfort food in the 90s and he restaurants that served  this were and still are considered avan guard. Then again though  out cultur eis so fast moving it isnt long before the avant guard becomes the guard.