Lean beef stroganoff

1 large onion, sliced and diced

2 crushed cloves of garlic (use a grater for speed!)

400g lean beef or beef medallions, thinly sliced

50g sliced button mushrooms

400ml of beef broth (or 1 stock cube dissolved into 400ml boiling water)

2 tbsp of tomato puree

1 tsp of Dijon mustard

1 tbsp of freshly chopped thyme or use ½ tsp dried thyme

Salt & pepper to season

½ tsp paprika

½ tsp Worcestershire sauce

½ tsp balsamic vinegar

90g of 0% fat-free natural yoghurt (brought to room temperature before using)

Spray oil