Lithuanian food has much in common with Eastern and Central European (Polish, Ukrainian, Russian, Ashkenazi Jewish) cooking. There are similar versions of stuffed dumplings (Lithuanian Koldūnai - similar to Polish Pierogi), pancakes (Blynai), cabbage rolls (Balandėliai), ground meat cutlets (Kotletai) and others.
Strong (and delicious!) influence also came from Germany, introducing pork, potato and
Another important contribution is from Scandinavian cooking (think herring - likely the most popular fish consumed by Lithuanians).
Of more exotic inputs is Karaite cuisine. The Karaite ethnic minority settled in Lithuania in the 14th century, and their stuffed meat pies (Kibinai) were enthusiastically accepted. Further, Lithuania even adopted a meat grilling style of Georgia, a country in the Caucasus mountains. The Georgian grilled meat skewers, nowadays called Šašlykai in Lithuania, emerged several decades ago and became the most popular type of Lithuanian outdoor grilling.
Learn more about these foods and see the pics in Glossary of Lithuanian Food.