stock cube
From Longman Dictionary of Contemporary Englishstock cubeˈstock cube noun [countable] a small solid cube made from the dried juices of meat or vegetables that is mixed with boiling water to make stockExamples from the Corpusstock cube• Add the chopped onion and stock cube and simmer for 8-10 minutes until the onion is tender.• In the meantime, cook the rice according to the instructions, using the pilau rice stock cube.• Bring a pan of water to the boil and add the stock cube.• Sprinkle the stock cube over and add the remaining ingredients.