Heat the olive oil in a large skillet/frying pan and toss in the shredded vegetables and a dash of cayenne for some heat. Cook over medium high heat for 4-5 minutes and then push the veggies to the outsides of the pan. In the middle, add the ground beef and brown (its okay if the veggies get mixed in during this step). Once the meat is almost cooked completely through, add the tomato paste and spices and stir until everything is coated. Reduce the heat and let simmer for 10 minutes. Add in the spinach, stir again and let simmer for an additional 5 minutes until the spinach wilts.
Remove from heat and enjoy with tacos, nachos, taco salad, stuffed peppers. I love cooking the taco meat this way, because frankly I don't actually really like vegetables, but I can hide them this way! Also I don't have any children of my own, but I imagine this would be an easy way to sneak vegetables to your little ones (you might have to skip the spinach though, the green shines through).