Mix together 2 tblsp of the lime juice, the onion, cilantro, corn, jalapeño, black beans and salmon, stirring well. On a separate plate, combine the cheeses. Divide half of cheese mixture evenly among 3 tortillas. Divide the bean mixture among the tortillas. Sprinkle evenly with remaining cheese. Top with remaining 3 tortillas.
Heat a large frying pan over medium-high heat and coat it with cooking oil. Carefully place 1 quesadilla in it and cook for 4 minutes on each side, until it is of a nice golden colour. Remove and keep warm. Wipe the pan clean with paper towels. Cook the remaining quesadillas the same way. Cut each quesadilla in half, and each half into 3 wedges.
Combine remaining 1 tblsp of lime juice, tomatoes, avocado, sour cream and salt. Mix it through gently. Serve with quesadillas. Garnishing with cilantro sprigs and lime wedges is optional but very delicious.

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