From an ABC News article about the new Burger King burger, the Big King:
"Despite the familiar ingredients all the way down to the third bun,
Burger King tells ABC News it doesn’t taste like the Big Mac because of
the way the burger is prepared — it’s fire-grilled. The Big King is also
40 calories less than its rival.
Brooklyn resident Ty Bills, who eats from both burger chains, sought
out the 'Big King' on the first day it launched. After the first few
bites he smiled and nodded.
'It's very juicy,' he said. 'The sauce is different. I don't know
what's in the sauce, but the sauce is good,' he added between bites."