Menu items like the “I Am Humble” bowl are part of the reason why L.A. vegans have been obsessed with Cafe Gratitude and its sister restaurants Gracias Madre and Sage. But now vegans are readying their kale knives after news recently spread that the owners of these restaurants have been slaughtering and consuming animals on their Northern California farm. The owners, Matthew and Terces Engelhart are being blasted on Twitter and Facebook and say they’ve received death threats. Their restaurants have received a deluge of angry one-star reviews on Yelp and there are calls for boycotts. And on Friday, irate activists plan to protest at Los Angeles locations.