Preheat oven to 350 degrees F
Place sliced peppers in baking dish and drizzle 1 tablespoon of olive oil, and a sprinkle of sea salt and black pepper. Toss peppers so all are coated with oil and seasonings.
Bake for about 30 minutes or until the peppers start to get dark. Remove from oven and allow to cool
In a saute pan add 1 tablespoon of olive oil, chopped garlic and spinach. Sauté until spinach is wilted and has changed to a dark green color. Sprinkle with sea salt and black pepper. Allow to cool slightly
Start building your sandwiches by placing four slices of sourdough bread on the counter
Cover each slice of bread with a total of 4 cheese slices on each slice of bread. ( 2 to cover the bread, and two deep)
Divide one half of the spinach on top of two slices of bread, leaving half of the spinach for later.
Place 6- 8 slices of roasted pepper on the bread, varying the color so when it is cut you'll see both colors of peppers.
Top these two slices with the remaining spinach.
Top the two finished sandwiches halves, with the other piece of sourdough that you have cheese already on, with the cheese facing the spinach. (You should have a total of 8 slices of cheese on each sandwich, 4 on the bottom and 4 on the top)
Melt the butter in a small pan over low heat, then add the finely chopped basil. Set aside till needed.
Heat your grill pan on the stove top until it is hot enough to leave marks on the bread.
Using a pastry brush, brush the basil-butter onto one side of the sandwich, and sprinkle with grated Romano cheese. Place the buttered side down on the pan.
Turn heat down to medium, and cover the sandwich with a pot lid to keep the heat in and help the cheese to melt.
After about 3-4 minutes check the bread on the pan to see how the color is. It should be toasted a dark golden brown.
Brush butter on the side that is up, sprinkle with grated Romano cheese and turn it over to repeat the process of toasting the bread. (Use the pot lid again to help melt the cheese)
After 3-4 minutes check that side, to see how the color is.
If the cheese is not fully melted, turn the heat down to low and keep the lid covering the sandwich until the cheese has melted. Just be careful not to burn the bread.
Slice the sandwich carefully with a serrated knife and serve immediately with a side salad.