Steak Sandwich with Sriracha Garlic Aioli

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What you'll need: 
Serves two

1 Filet Mignon
1 Spanish Onion
2 Handfuls Arugula or Leafy Greens
2 French Buns (or that of your choice)
7 Tbsp Salted Butter
5 Tsp Sea Salt
3 Tsp Cracked Pepper
1 Tsp Garlic Powder
3 Tsp Thyme 
6 Tbsp Sriracha Mayo
1 1/4 Tbsp Lemon Juice
1 1/2 Cloves Minced Garlic 
1/4 Tsp Pepper 
3/8 Tsp Salt 

Directions: 

1. Bring steak to room temperature before cooking and preheat oven to 425 degrees
2. Marinade steak with 5 tsp of salt, 3 tsp of cracked pepper and 1 tsp of garlic powder
3. Using a cast iron skillet, melt 3 tbsp of butter on medium-high heat
4. Fry steak on one side for 2-3 minutes before flipping and frying for another 2-3 minutes
5. Return steak to original side and melt 1 tbsp of butter to one side of the skillet
6. Add 3 tsp thyme to melted butter
7. Spoon butter/thyme mixture on top of steak and transfer skillet into oven 
8. Bake for 15 minutes for a medium-rare steak 
9. Meanwhile, add 2 tbsp butter to a fry pan on medium heat
10. Chop onions and fry in butter until soft
11. To make sauce (garlic sriracha aioli), combine sriracha mayo, lemon juice, minced garlic, pepper and salt in bowl
12. Cover bowl and store in refrigerator for 30 minutes before using to avoid bitterness
13. Remove steak and cover with tin foil - wait 5 minutes before slicing
14. In the meantime, place buns in the oven cut lengthwise, face-down to toast 
15. Once buns are toasted to satisfaction, remove from oven and slice steak onto each sandwich, place onions, spread some of the garlic sriracha aioli sparingly and top with arugula or leafy greens, use excess sauce to dip as desired