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Simmer ingredients in a small saucepan over low heat for 10-15 minutes, or until it coats the back of a spoon. Remove from heat and allow to cool to room temperature to thicken.
Sauté the kale with the olive oil and balsamic in a medium-sized frying pan or cast iron skillet over medium heat until the kale cooks down, shrinks, and becomes wrinkly, about 10 minutes, stirring every few minutes. Remove from heat and set aside.
Brush both side of each slide of bread with a tablespoon of the butter and toast them on a grill or griddle until lightly golden. Remove from heat and set aside.
Sprinkle or spread 1 ounce of cheese onto each toast, sprinkle each with a pinch of black pepper, and place a few pieces of kale over the cheese. Drizzle the balsamic reduction over the crostinis and serve immediately.