Cut the base off the head of the endive and separate the spears. Wash leaves thoroughly and dry gently with a paper towel. Toss the mango, feta cheese, and salt in a small bowl until just mixed.
Divide mango mixture evenly between the endive spears, and top each with pine nuts. Lightly drizzle the balsamic glaze over the cups just before serving.
Notes
Note: If you don’t mind adding an additional ingredient, making this a 6-ingredient recipe, I highly recommend topping the cups with slivered basil along with the pine nuts.