Steak & Chipotle Mayo Sandwich (Print Version)

# Ingredients:

→ Caramelized Onions

01 - 3 large red onions, sliced
02 - 3 tablespoons olive oil
03 - 1 teaspoon Diamond Crystal Kosher salt
04 - ½ cup water, plus more as needed

→ Chipotle Mayo

05 - 1 cup mayonnaise
06 - ¼ cup sour cream
07 - 3 chipotle peppers in adobo
08 - 3 tablespoons adobo sauce

→ Sandwich

09 - 1½ pounds skirt steak
10 - 1 large baguette or 4 ciabatta rolls
11 - ½ pound deli-sliced provolone
12 - 1-2 cups baby arugula (optional)
13 - 2½ teaspoons Diamond Crystal Kosher salt
14 - ½ teaspoon black pepper
15 - 2 tablespoons neutral oil
16 - 1 tablespoon olive oil, plus more if needed

# Instructions:

01 - Cook onions with water, oil, and salt covered 12-15 minutes until soft. Uncover and cook 30 minutes more until caramelized.
02 - Mix mayonnaise, sour cream, chipotles and adobo sauce. Season to taste.
03 - Season steak, sear 3 minutes per side. Rest 5 minutes then slice against grain.
04 - Layer bread with mayo, steak, onions, and cheese. Brush top with oil. Bake at 450°F for 3-5 minutes. Add arugula if using.

# Notes:

01 - Can quick-sauté onions instead of caramelizing
02 - Onions can be made ahead
03 - Leftovers keep 3 days