In a medium bowl, combine quinoa with hummus, red pepper, celery and scallions. Season with salt and pepper to taste.
Heat a non-stick pan over medium high heat and add olive oil once heated.
Form quinoa mixture into palm-sized patties and brown in pan, working in batches, about 3-4 minutes per side. Be careful not to overcrowd the pan.
Serve with additional hummus and tomato slices.
Notes
If the quinoa cakes fall apart while cooking, simply use a spoon or spatula to re-shape and press together. It's not a beauty contest - they will taste delish regardless of what they look like. :)