Creamy watercress sauce

Tags: made
. 9 steps
2 tablespoons olive oil   Heat oil, cook, stirring, until soft Before use, return to pan, stir over heat until slightly thickened.
1 medium onion chop
1 clove garlic crush
1/2 cup dry white wine   Add, boil uncovered until reduced by 1/3
1/2 cup fish stock
300ml cream   Add, stir until mixture boils and thickens
1 1/2 teaspoons cornflour blend
2 teaspoons water
1 1/2 cups firmly packed watercress   Add, process until smooth
Serves 4, makes 2 cups