Prepare Ingredients: Bring a medium pot of water to a boil. In a large bowl, whisk together apple cider vinegar, mustard, and 3 tbsp olive oil until combined. Season with salt and pepper to taste, then add red onion and set aside to pickle until Step 4.
Cook Banza: While tomatoes and halloumi cook, add Banza orzo to boiling water and cook according to package directions.
Finish Orzo Bowl: To a bowl with pickled onions, add cucumbers, parsley, and tomatoes. Mix in Banza orzo, then taste and season with salt and pepper as desired. Garnish with halloumi and a dollop of hummus or tzatziki. Enjoy!