Begin by slicing the leeks. Rinse them thoroughly under cold running water to remove any dirt or grit. Pat them dry with a paper towel and slice into thin rounds, using only the white and light green parts.
In a large skillet or oven-safe pan, melt the 2 tablespoons of unsalted butter over medium heat. Add the sliced leeks and season with a pinch of salt and pepper. Sauté for about 5-7 minutes, until the leeks are soft and translucent.
While the leeks are cooking, crack the 10 large eggs into a mixing bowl. Add the ½ cup of heavy cream, 1 tablespoon of fresh dill, and a pinch of salt and pepper. Whisk vigorously until the mixture is well combined and slightly frothy.
Gently fold the hot smoked salmon and crumbled goat cheese into the egg mixture. Be careful not to break up the salmon too much; keep some nice pieces for texture.
Once the leeks are ready, pour the egg mixture over the leeks in the skillet. Use a spatula to gently stir everything together, ensuring that the leeks are evenly distributed.
Cook the frittata on the stovetop over medium heat for about 5 minutes, or until the edges begin to set. Then, transfer the skillet to a preheated oven at 350°F (175°C) and bake for an additional 15-20 minutes, or until the center is set and the top is golden.
Once cooked, remove the frittata from the oven and allow it to cool for a few minutes. Slice into wedges and serve warm or at room temperature, garnished with extra dill if desired.