Heat the oil in a large, deep saucepan over a medium high heat and add the mince. Brown all over cooking for 5-7 minutes.
Add the garlic, ginger and green beans and cook for a further 5 minutes.
While this is cooking, make up the sauce by putting the cornflour in a jug or bowl and gradually mixing in the soy sauce (do this gradually so it doesn't go lumpy). Then add in the other ingredients and stir until smooth.
Turn the heat up to high, pour in sauce and let it bubble for 2-3 minutes and coat everything.
Serve over rice, sprinkled with sesame seeds.
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