Kumquats, the babies of the citrus family, have a sweet, edible rind and a slightly tart pulp (everything is edible except for the seeds). I typically muddle them in mojitos or caipirinhas, but incorporating them in this spicy salsa as a substitute for tomatoes adds a soft, sweet touch to this topping for quickly cooked fish.
You could also try adding cubes of ripe avocado to the salsa as well — I see no reason why that wouldn't be a fabulous addition. Alternatively, you can use other flaky white fish instead of tilapia if it's not available.
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