Sgt. Frog Episode 84: Momoka, Lunch in Space / Keroro, Protect the Mushrooms!
Episode 84 of 358 of Sgt. Frog, aired November 11, 2005, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Momoka makes a boxed lunch for Fuyuki, but she`s at a loss for the perfect way to give it to him. Then she comes up with a perfect plan: she`ll take him up in a space shuttle! After that, Keroro learns how expensive a certain type of mushrooms are, and decides to grow them himself for the money. Source: crunchyroll