When you need a flavorful, hearty vegetarian lunch (or light dinner), this Halloumi Sandwich with Romesco Sauce is the answer! It's easy to make and has wonderfully vibrant flavors.
If not already storebought or homemade, prepare the romesco sauce. I halve the amount of salt if I'm making it specifically for these sandwiches since the halloumi is already pretty salty.
Slice the ciabatta rolls, if needed, and spread approximately ½ Tablespoon of romesco sauce on each half. Top each half with arugula, and any additional toppings you're using.
Cook halloumi: Remove the block of halloumi from the package and pat dry with paper towels. Cut the block into slices lengthwise, so you have a large rectangle. I prefer about 1/2-inch slices.
Brush both sides of the slices with oil until coated. Heat a cast-iron skillet over medium-high heat. If using a grill pan, stainless steel, or a not-well-seasoned cast iron, I also like to brush oil on the pan.
Place the slices evenly across the pan. Sear until golden brown, around 1-2 minutes, then flip and sear the second side, again until golden brown, around 1-2 minutes. Some liquid may sizzle out of the slices; it will quickly evaporate and then the side will turn golden.
Remove from the pan and top on the sandwiches. Serve immediately.
Notes
The size of your halloumi block may vary, depending on where you purchase it. The cooking instructions are the same either way and cook time will depend on how thick you slice it.
Serving size: you can easily make just 1 or 2 sandwiches or more as needed!