Can I make the herbed mayo ahead of time?
Yes. Mix the mayo, red wine vinegar, garlic salt, Italian seasoning, and parmesan in a bowl and refrigerate for up to 3 days. Stir before using.
What's the best way to grill this sandwich without burning it?
Use medium heat, butter or oil both bread slices, and grill 3–4 minutes per side until golden. Cover with a lid or foil for the last minute to ensure the cheese melts through.
Can I substitute provolone cheese?
Yes. Swiss, mozzarella, or cheddar work well. Swiss adds a nuttier flavor; mozzarella melts very smoothly.
Is this sandwich good cold or only hot?
It's best served warm while the cheese is melted and bread is crispy. If storing leftovers, refrigerate and reheat gently in a skillet or toaster oven.
How many slices of deli turkey should I use per sandwich?
The recipe calls for 4 slices. Layer them evenly so they cover the bread without gaps for consistent flavor in each bite.