Steak with Sweet Apple Sauerkraut

• Slice the onion into half rings. Core and dice the apple. 
• Drain and rinse the sauerkraut under cold water.
• Melt a knob of butter in a frying pan over medium-high heat. Fry the apple for 2 - 3 minutes.
• Lower the heat and add the sugar, then allow to caramelise for 1 minute.

• Add the sauerkraut and cook gently for 6 - 8 minutes.
• Add a knob of butter and cook for 2 more minutes, covered. Season with salt and pepper.
• Mash the potatoes and garlic with a knob of butter, the mustard and a splash of milk. Season to taste with salt and pepper.

• Melt a knob of butter in a frying pan over medium-high heat.
• When the butter is nice and hot, fry the steak for 1 - 3 minutes per side (see Tip).
• Remove from the pan and season to taste with salt and pepper. 
• Allow to rest for at least 3 minutes under aluminum foil.

Tip: fry the steak for more or less time as preferred, depending on how rare you'd like it. 

• Fry the onion in the same pan for 2 - 3 minutes over medium heat.
• Add the strawberry sauce, the balsamic vinegar and the reserved cooking liquid.
• Mix well and allow to reduce gently for 2 minutes, then turn off the heat.
• Stir in a knob of butter and season to taste with salt and pepper.