Heat a skillet over medium heat and lightly coat with extra virgin olive oil.
Add the grass-fed ground beef to the pan and cook, breaking it apart as it browns.
Season lightly with pink salt and black pepper.
Once the beef is fully cooked, stir in the collagen peptides until evenly incorporated.
Remove from heat and set aside.
In a small bowl, combine the mayonnaise, mustard, pickle relish, vinegar or lemon juice, pink salt, and black pepper. Mix until smooth and creamy.
Warm the cassava-based tortillas in a dry skillet or directly over low heat until soft and pliable.
Place a thin slice of grass-fed cheese onto each tortilla.
Spoon the beef mixture evenly over the cheese, fold the tortillas, and return them to the skillet. Cook briefly on each side until lightly crisped and the cheese melts.
Remove from heat and carefully open each taco. Top with romaine lettuce, tomatoes, red onion, and chopped pickles.
Drizzle with the rebalanced creamy sauce and serve warm.