Ginjinha or simply ginja, is a portuguese liqueur made by infusing ginja berries (sour cherry, prunus cerasus austera, the morello cherry) in alcohol (aguardente) and adding sugar together with other ingredients, with cloves and/or cinnamon sticks being the most common. ginjinha is served in a shot form with a piece of the fruit in the bottom of the cup. it is a favourite liqueur of many portuguese and a typical drink in lisbon, alcobaça, óbidos, marvão, covilhã and algarve. the serra da estrela ginja, centered around covilhã, has protected designation of origin.

Source: Wikipedia