Question: Desserts from which country contain fish?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/> 
PREFIX res: <http://dbpedia.org/resource/> 
SELECT DISTINCT ?uri 
WHERE {
        ?x dbo:type res:Dessert .
        ?x dbo:origin ?uri .
        ?x dbo:ingredient res:Fish .
}