1. In a small saucepan over medium heat, whisk together the sesame oil, soy sauce or tamari, brown sugar, 2 tablespoons of the vinegar, chili paste, tomato paste, and garlic. Bring to a low boil, then reduce heat to low and let simmer for ten minutes. Remove the sauce from heat and set aside.2. In a medium-size bowl, combine the carrot, daikon, and remaining 2 tablespoons of vinegar, toss thoroughly, and set aside.3. Brush the steaks with the oil. In a skillet or grill over medium-high heat, grill each steak for 3 minutes per side. Remove the steaks from heat and cut each into strips.4. Toss the strips in the sauce and return to the grill or skillet for another 2 to 3 minutes. Remove from the heat.5. Lightly toast each piece of bread. Spread the mayo on the inside of each piece of bread, then layer on the roast, cucumber, carrot mixture, jalapeño, and cilantro.