Serves 4-6 as a snack.
Gently combine tomatoes, spring onions, avocado, lemon juice, oil, salt and ground pepper. Taste for seasoning.
Spray tortillas with oil and top with cheese. Spray the edge with a little oil, top with another tortilla and fry on both sides in a lightly oiled pan until golden brown.
Cut quesadillas into wedges and serve with a spoonful of the salsa on top.
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