• Preheat oven to 400*
• Get out and measure all of your ingredients.
  
• Heat a cast iron skillet over medium high heat.
• Add garlic powder, onion powder, sea salt, and black pepper to a ramekin
  
• Stir to until blended.
  
• Season all sides of the tenderloin with seasoning.
  
• Rub until covered.
  
• Add 1 tablespoon olive oil to the skillet and swirl to coat. Sear each side of the tenderloin for 2 minutes per side. Cut the head of garlic in half and add to the pan cut side down. Add butter to the pan and cook for 1 minute, spooning butter over the steak as it cooks.
  
• Place the garlic halves into the center of the skillet and sit the steak on top of them. Place into the oven and cook for 12 minutes. (12 minutes for medium rare, 15 minutes for medium)
  

Make Relish

• Get out and measure all of the ingredients.
  
• While the steak is cooking, prepare toppings. Add red pepper flakes and cherry tomatoes to a food processor.
  
• Add chopped red onion.
  
• Add red chili.
  
• Pulse 2-3 times to lightly break up the vegetables.
  
• Add to a saucepan with white wine vinegar and cook for 5 minutes over medium low heat.
  
• Remove from heat.
  
• Stir in chopped basil.
  
• Set aside.
  

steak sandwich sauce

• Get out and measure all of your ingredients.
  
• Prepare mustard steak sandwich sauce. In a small bowl, add mayo, mustard, crushed garlic, and horseradish.
  
• Whisk until blended.
  

Making the Sandwich

• Remove tenderloin from the oven
  
• Baste with butter. (Check for desired temp with a meat thermometer. Keep in mind the temperature will raise 5-7* while resting.) Cover with a foil tent and let rest for 10 minutes.
  
• Lightly drizzle olive oil over the sliced ciabatta bread. Heat a cast iron grill pan over high heat and place ciabatta cut side down onto the pan. Toast for 1 minute. Honestly, we have even put these slices of bread right into our toaster too.
• Thinly slice the tenderloin and place on toasted ciabatta.
  
• Top with spicy mustard steak sandwich sauce..
  
• Romaine lettuce.
  
• Sliced tenderloin.
  
• And your chili relish.
  
• Serve.
  
• Enjoy every bite!