(CNN) Former Vice President Joe Biden and Sen. Bernie Sanders are sparring through food metaphors on the campaign trail as the Democratic Party's presidential candidates inch closer to their first caucus showdown in Iowa.

Biden, asked about Sanders' claim that President Donald Trump "will eat (Biden's) lunch," had a quick response: "Tell him come and I'll give him some dessert at the White House."

Biden's latest quip comes in response to what the Vermont senator told the Los Angeles Times editorial board in an interview last week when Sanders was asked if he is too far left to unite moderates in a general election. Sanders talked about why he can unify the electorate and then, unprompted, pivoted to Biden and why his "same old, same old type of campaign" will not work.

"If you are, if you're a Donald Trump and you got Biden having voted for the war in Iraq, Biden having voted for these terrible, in my view, trade agreements, Biden having voted for the bankruptcy bill. Trump will eat his lunch," Sanders said.

This is not the first time the two Democratic hopefuls have clashed. During the December debate in Los Angeles, Biden and Sanders disagreed loudly over a familiar battle: who has the most effective healthcare plan, leading to a comical moment when Sanders waved his hand to interject Biden's pitch . "Put your hand down for a second, Bernie, OK?" Biden said. "Just waving to you, Joe!" Sanders responded.

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