01 -
Gently pat the mahi mahi fillets dry using a paper towel to remove excess moisture.
02 -
Whisk olive oil, lemon juice, kosher salt, and ground black pepper in a small bowl. Evenly brush this mixture over both sides of the fillets.
03 -
Set grill to medium-high heat (about 400°F). Place fish onto the grill and cook for 4 to 5 minutes per side, until opaque and easily flaked with a fork.
04 -
Combine diced zucchini, yellow squash, red onion, halved cherry tomatoes, and chopped cilantro in a medium mixing bowl. Drizzle with freshly squeezed lime juice and gently toss to combine.
05 -
Taste salsa and adjust seasoning if necessary. Incorporate diced jalapeño for heat if desired. Arrange grilled fish on plates and generously top with summer squash salsa. Garnish with diced avocado if using.