Combine salmon, apple, cheese, tarragon, onion, lime juice and Jammin' Salmon seasoning in a large bowl and mix well. Spread one-fourth of the mixture over half of each tortilla and fold over.
Heat a large non-stick pan. Brush each side of the quesadillas with melted butter; cook at a medium heat for 3 to 4 minutes on each side or until golden brown. Cut into three triangles and serve with horseradish crema and a dash of Jammin' Salmon seasoning.
Horseradish Crema
Wisk all ingredients together in a bowl and serve on top of warm quesadillas. Any leftovers are great on steak, prime rib or a burger.