Bitteraneo Mediterranean Tentoura Bitters 100ml. Bitteraneo Mediterranean Tentoura Bitters is produced exclusively from natural Mediterranean ingredients 100% natural bitter extracts of excellent quality and high concentration, for a great performance and intense aroma and flavour. It is based on Tentoura Castro, the traditional Greek liqueur made from natural extracts of cinnamon, cloves, fruits and spices. Artemisia balances the bitterness and just a bit of Greek honey gives a golden touch.