Matti is like every child: curious about the world, he tries everything, turns things upside down, and keeps his family on their toes. You just have to love him! Matti loves jam sandwiches more than anything. And now he urgently needs one. But Mama is busy taking care of Matti's little sister Lia. So there’s only one thing to do: Matti has to make a sandwich for himself. It's clear that this won't happen without some mess. Will Mama be as happy about his jam sandwich as Matti is? A story for reading aloud to children aged 2 and up, full of everyday comedy and small, loving scenes where children and parents can see themselves reflected.