Mix the tomato paste, vinegar, golden syrup and soy sauce and set apart. Slice the beef into 1cm wide strips. Clean the beans.
Steam the beans in a pan with little water for 15 minutes.
Bring water to the boil. Put the couscous in a bowl. Crumble the stock cube and mix it in with the couscous. Pour just enough boiling water on top of it to cover.
Stirfry the beef for two minutes. Pour the tomato sauce onto the beef and mix it. Stirfry for another two minutes. Drain the beans and mix them in with the beef.
Take a fork and mix the couscous to mix in the stock cube and to make it fluffy.
To serve: put the beef and beans on top of the couscous. This enables the sauce to drip into the couscous.