sweetened condensed milk
Put condensed milk in a small saucepan. Heat until it just comes to a boil and add chocolate. Immediately lower heat and stir until blended. Continue to cook, over low heat, stirring constantly, about 1 minute, until chocolate has completely melted.
Stir in pecans and cook a few seconds. Pour the warm mixture into a square pan or a mini-loaf pan (line with plastic wrap or lightly spray with cooking spray first). Refrigerate until cold.
Let sit at room temperature 5 to 10 minutes, then cut into squares or slices.
Place pecans in a small non-stick skillet and add a large pinch of salt. Cook over medium heat, stirring constantly, until nuts are toasted (don't over-cook!). Set aside to cool.