What you need:

• 1 lb lean beef tenderloin (or lean flank steak)
• 2 tbsp blackening seasoning
• 1 tsp lime zest
• 1 tbsp butter (or ghee or olive oil)
• 2 tsp grapeseed oil (or olive or vegetable)
• 1 head romaine lettuce
• 1 bell pepper, sliced
• 1/4 red onion, sliced
• 1/2 cup shredded reduced fat cheddar cheese
• 1/3 cup nonfat plain Greek yogurt (dressing)
• 2 tbsp low fat mayonnaise (dressing)
• 1/2 tbsp taco seasoning (dressing)
• 1/2 lime, juiced (dressing)
• 2 tbsp chopped cilantro (dressing)
• 1 garlic clove (dressing)
• 2 tbsp red onion (dressing)
• 1/2 serrano pepper, seeded and diced (or jalapeno, for dressing)
• 1 tbsp olive oil (dressing)