What's the name of the song that plays in episode 5 when Haruhi tastes Hikaru's food?

Okay, so in episode 5 (The Twins Fight!), Haruhi sits with Hikaru and he willingly trades his lunch for hers. So, when she tries the traded food, there's a background song that comes on and it's been driving me insane by not knowing the name of it! What is the name?