Preheat oven to 400 degrees.
Cut about ½ inch off the top of a head of garlic (enough to expose all the cloves), place on foil, drizzle with olive oil, season with Kosher salt and wrap tightly. Bake the clove for 45 minutes, remove from oven and carefully open foil and let cool – turn oven down to 350.
Heat a medium pot on the stove, add tablespoon of oil and the onions & peppers – cook until barely softened, about 5 minutes.
Squeeze garlic cloves into the onions, add the spinach and stir well to combine.
Add flour and cook for about one minute (you’re cooking out the flour taste). Slowly add the milk, whisking constantly until slightly thickened and starting to bubble.
Add tuna, ricotta, Zatar and season with salt and pepper – mix well.
Put cooked and drained shells in a 9”x11” baking dish, 8” cast iron pan, or any favorite baking dish and add tuna mixture. Try to get some of the tuna mixture into each shell.
Top with bread crumbs, and bake 25 minutes or until golden. Remove from oven and serve warm.
