I've been eating the Beyond Meat (pea protein) burger from A&W for a while now. It's pretty damn close to the taste of beef, I'm happy to make the switch. It has an aftertaste that some might describe as metallic, but you really have to look for it, it's not that strong.

What shocked me was how much the taste of a burger comes down to texture. There's enough toppings on burgers that you don't really get the beef taste anyways, the patty is really just there for texture!