Cascone and Grossman co-own 24 Prince, a restaurant in New York City's SoHo district.
The 31-year-old Grossman proposed to Cascone while she was cooking dinner.
"I tied the ring around one of the dogs' necks and tried to get him to run over to Nikki," Grossman told People. "But that wasn't happening ... so in the end I told Nikki to go see the dog."
And once she did, it apparently didn't take her long to begin planning the couple's wedding.
"Nikki started planning two seconds after I proposed," Grossman told People.
Cascone and Grossman are planning to wed in Spring 2010 ceremony that will be "green and sustainable" and feature 200 guests, according to People.
Cascone finished in eighth place on Top Chef: Chicago, the fourth season of the Bravo reality culinary competition that aired last spring.
DISCUSS AND COMMENT ON THIS STORY Reality TV World now offers Facebook Comments on our stories. To post a comment, log into Facebook and then 'Add' your comment. To report spam or abuse, click the 'X' in the upper right corner of the comment box. Get more Reality TV World! Follow us on Twitter, like us on Facebook or add our RSS feed.