Oobi and Kako help prepare a special dinner for Grampu and Inka. Oobi and Kako act as waiters, pretending it's a fancy restaurant. Inka and Grampu have a lovely romantic dinner and invite Oobi and Kako to join them for dessert. — NickJr.com (source)
Oobi and Kako are in the kitchen, watching Grampu make spaghetti and meatballs. Grampu explains that it's for his upcoming dinner with Inka. Oobi and Kako start to giggle and taunt Grampu about his big crush on Inka, but they stop to go set the table for him. They bring a basket of cups, forks, and spoons to the dining room. Kako invites the viewers to help him and Oobi place everything in the right order. Kako shows them the proper order, so Oobi tries. However, he can't remember what comes after the fork, so the viewers help him out.
Oobi gets the idea to turn the house into a restaurant for Grampu's date. Kako agrees, and the boys make the room look like a French-style café. Oobi names the restaurant "Chez Oobi". The next scene shows Grampu putting the finishing touches on his spaghetti. He's called into the dining room by Oobi and Kako, who are now wearing big bow ties. They welcome Grampu to Chez Oobi and show him all the decorations they put up: lights, a nice tablecloth, and a toy dinosaur holding up a flower. Grampu asks what it's for, and the boys say it'll eat the leftovers. Grampu is very excited and says that tonight will be all about good music, good food, and good friends.
Inka rings the doorbell, scaring Grampu. He rushes to the door and lets her in. Inka's wearing an orange dress for the occasion, and Grampu loves it. Inka looks around the room and is dazzled by all the decor. Oobi and Kako bring the adults over to their radio and go through some music selections for them. First, they try soft violins. Grampu and Inka like it, but the boys don't, and they change the station to jazz music. Grampu and Inka like this, too, but the boys again change the station to "Itsy Bitsy Spider". The boys are happy with their choice, but Grampu tells the boys to go back to the soft violins. They switch it back and bring Inka to the table.
Oobi and Kako tell Grampu and Inka the menu: spaghetti, spaghetti with one meatball, spaghetti with two meatballs, or their "special", spaghetti with three meatballs. Grampu and Inka both order the special, and they drink while they wait to be served. They talk about places they have visited, like Paris and St. Louis. Then, Grampu drinks all of his water, so Inka suggests they both share the same cup. Soon, Oobi and Kako deliver the entrées.
Inka tells them "Bon appétit!", which she explains is French for "Good appetite". Oobi and Kako nervously ask if the food is okay, but Inka assures them that it's just right. While Grampu and Inka eat, an interview segment plays. It involves Uma asking kids about their favorite dishes. The scene cuts to Chez Oobi again. Grampu and Inka are seen sucking from a strand of spaghetti, seemingly about to kiss...but Oobi interrupts them suddenly with their dessert: fruit tarts. He and Kako explain that they come with the special.
Inka compliments the boys on their service, and she wants Oobi and Kako to join them. They sit down and ask Grampu and Inka about their experience. Grampu says that they got everything they wanted: good music, good food, and good friends. Oobi and Kako congratulate themselves by doing their secret handshake, which they nickname the "Woo-woo". They ask Grampu, Inka, and the viewers to do the same. The episode ends with Oobi, still dressed as a waiter, waving "goodbye" to the viewers.