This Reuben Casserole is so delicious served hot out of the oven and reminiscent of the sandwich on rye bread minus the fennel seeds. Carnivore Thousand Island dressing: Mix together, 1/3 cup Real Mayonnaise (unsweetened), 1/4 cup avocado oil, 1 egg, 1 Tbs. Tomato Paste (level), 1 Tbs. Vinegar, 1/4 tsp. Salt, 1 tsp. Onion Powder.