INGREDIENTS
•
vegetable oil - 2 tbsp
•
all-purpose flour - 2 tbsp
•
salt and pepper - generous amount
•
beef - 10 oz (300 g), sirloin strips, cubed
•
butter - 1 tbsp
•
red onion - small, chopped
•
baby portabello mushrooms - 8 oz (250 g), quartered
•
dry white wine - ½ cup
•
tomato paste - 2 tbsp
•
dijon mustard - 1 tbsp
•
beef stock - 1 cup
•
all-purpose flour - 2 tbsp
•
sour cream - ½ cup