In a large sauté pan over medium heat, add ground beef and sauté for 7 minutes until browned, adding taco seasoning and salt and pepper halfway though. Transfer into an 8x8 dish (I like to transfer the juice too as it has a lot of flavor).
Add cauliflower rice to pan and cook for 4-5 minutes until softened. Stir in cilantro, lime juice, and salt and pepper and distribute over top of beef, spreading out evenly.
If needed, add 1 teaspoon oil to pan. Add onions and sauté for 3 minutes. Add peppers and salt and pepper and sauté for another 3-5 minutes until softened. Layer on top of cauliflower rice.
Cover peppers with a layer of romaine, then tomatoes, avocado, and pickled jalapeños. Garnish with fresh cilantro and enjoy!