Last month, the US Department of Agriculture and FDA convened to debate meat: what it is and isn't, and if plant-based or lab-grown products like those made by Impossible Burger and Memphis Meats should be called meat. Lab-grown meat is still months from market, but vegetarian meats already have the poultry and cattle industries in a tizzy. Sales of meat analogues are growing at steady clip of 23 percent a year, nibbling out a decent market share.