From-Scratch Slow Cooker Beef Stroganoff

• 1 kg / 2 lb beef, cut into 1x5cm strips
• 2 onions, sliced
• 3 cloves garlic, crushed
• 500g / 1lb mushrooms, sliced
• 1/2 cups tomato paste
• 1 cup tomato puree
• 2 tbs paprika
• 1 cup beef stock
• 1 tbs mustard
• 3/4 cups sour cream
• 1 pinch salt and pepper to taste 

1. Add all of the ingrients in a slow cooker, except mushroom and sour cream.
2. Cook for 9-10 hours on auto.
3. Add mushrooms 1 hour before serving.
4. Fold in sour cream 15 minutes before serving or right before serving but make sure it warms through. 
5. Serve with egg noodles or a side dish of your choice.