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Shake Shack is getting in the Easter spirit, mixing the pig and the cow for a special limited-time burger. Now through Sunday, the Dupont Shack will be slinging the Easter HAMburger, a Shack Burger topped with griddle Niman Ranch country-style ham, American cheese and pickled shallots for $6.50. A variation of the new burger combination first appeared at the SoBe Burger Bash in February (though with pickled green tomatoes), and while it IS currently a limited-time offer, it very well may follow in the footsteps of the bacon-topped SmokeShack, which debuted at SoBe in 2012 and became a permanent menu addition just three months later.  There's also a special Shackbury Easter Egg concrete (vanilla frozen custard blended with caramel sauce & milk chocolate chunks), but really, we're just excited about the burger. Shake Shack | 1216 18th Street NW | DC | shakeshack.com | @shakeshack