To prepare chicken, combine first 4 ingredients in a large bowl; toss and let stand 3 minutes. Remove chicken from marinade; discard marinade. Sprinkle chicken evenly with 1/4 teaspoon salt. Heat a grill pan over medium-high heat. Coat pan with cooking spray. Add chicken to pan; cook 6 minutes on each side or until done.
To prepare salsa, combine tomato and next 4 ingredients (through pepper) in a medium bowl. Add avocado; stir gently to combine. Serve salsa over chicken.
Pairing Strategy
Acidic citrus marinades require side dishes that absorb residual surface liquids without clashing with the sharpness of fresh lime juice. Steamed white rice or quinoa works well because bland starches balance the high acidity of the chicken marinade and prevent palate fatigue. When plating, place the hot protein directly over a warm grain bed so the residual heat gently warms the diced tomatoes and avocado salsa resting on top without turning the fruit mushy. Additional freshness comes from pairing the dish with lightly dressed cabbage slaws that offer a distinct textural contrast to the tender meat and soft avocado. Roasting whole jalapeños alongside the main dish introduces a smoky element that tempers the brightness of the raw cilantro.
Acid Management
Marinades containing fresh lime juice break down surface proteins rapidly if left in contact with meat for too long. Limit marination times to under thirty minutes because prolonged exposure to citrus acid transforms the exterior texture of chicken breast halves into a mealy, chalky surface that refuses to brown properly in a grill pan. Thoroughly patting the poultry dry with paper towels immediately before cooking removes excess moisture and ensures better contact with the heated metal surface, yielding distinct grill marks at medium-high heat. When combining the salsa ingredients, fold the chopped avocado in last with minimal agitation to preserve the structural integrity of the pieces.
Storage Dynamics
Avocado salsa degrades rapidly when exposed to oxygen due to natural enzymatic browning reactions in the fruit. Consume the salsa immediately after preparation, or press a sheet of plastic wrap directly against the surface of the mixture to seal out air if holding it in the refrigerator for up to two hours. Cooked chicken breasts maintain adequate moisture for up to three days when stored in an airtight container, though reheating should be done gently at fifty percent power in a microwave to prevent the lean white meat from turning rubbery.