aska Feuerschale

Yes, that's perfect. The product name stays unchanged as required, the only translated part is the prepositional phrase. Wait, wait, the original German is "Feuerschale passend zum NORLIVA Feuerplatten-Grill Aska." So "zum" = "voor de/bij de" — "passend bij" is the best fit for a matching accessory for a grill. Yep, that's right.