Melt 2 teaspoons coconut oil in a large cast-iron skillet or non-stick pan over medium heat. Add the quince slices and vanilla extract and sauté, gently stirring, until they just begin to soften.
Lower the heat, add a pinch of sea salt, 1 teaspoon ground cinnamon, and 1 tablespoon of water (more if needed so that the slices don’t stick to the bottom of the pan). Continue stirring until softened and beginning to caramelize.
Add 2 teaspoons runny honey (or pure maple syrup), gently stir until all the quince slices are coated, and immediately remove from heat.