- 2 limes, zested and juiced
- 2 romaine hearts, chopped
- 2 Granny Smith apples – peeled, cored, and cut into chunks
- 1/2 cup chopped cucumber
- 1/3 cup chopped fresh mint
- 1/4 cup simple syrup
- 2 tablespoons lemon juice, or to taste (optional)
- Combine the lime zest, lime juice, romaine lettuce, apple, cucumber, mint, simple syrup, and lemon juice together in a large bowl; toss to combine.