Heat all ingredients in a heavy bottom sauce pan. Simmer on low until reduced by half and sugar has dissolved. Run through a strainer and discard strained solids and chill dressing until ready to serve.
Combine avocado, cilantro and lime juice in a small food processor or blender. Pulse until smooth. Set aside until ready to plate.
On serving dishes, alternate red and yellow heirloom tomatoes with fresh burrata, overlapping slightly. Divide all ingredients evenly on the two plates.
Place frisee lettuce in the center.To Finish:Place a smear of avocado spread on the side of both serving dishes using the back of a spoon. Drizzle serrano-passion-fruit dressing over tomato and burrata.
Garnish with Maldon sea salt, freshly ground black pepper and fresh basil.
Notes: If you can’t find passion fruit puree and are substituting passion fruit preserves, combine ¼ cup preserves and 1/4 serrano chile, seeded, with 1 tablespoon water in a small food processor or blender. Pulse until smooth.