First, in a big saucepan over medium heat, combine your chosen sweeteners and 4 tablespoons of the butter. Bring this mixture to a boil and let it cook gently for 2 to 4 minutes, making sure to watch it closely so it doesn't burn. Take the pan off the heat and carefully stir in the heavy cream; it will bubble up nicely!
Next, sprinkle the xanthan gum over the surface of the caramel and whisk it in until it's smooth. Whisk in the sea salt. Allow this delicious caramel to cool and thicken for 30 to 60 minutes until it's still pourable but quite firm.
While the caramel cools, preheat your oven to 350°F. Line a baking sheet with parchment paper or a silicone baking mat. Spread the pecan halves in a single layer on the prepared sheet and toast them in the oven for 7 to 10 minutes, until they are fragrant and lightly browned. Once toasted, arrange the pecans into small clusters of 3 or 4, aiming for about 24 clusters in total.
Carefully drizzle a few teaspoons of the cooled, thickened caramel over each pecan cluster, ensuring that every pecan gets a touch of that gooey sweetness. Pop the baking sheet into the freezer to let the caramel firm up completely.
In a small, heat-safe bowl placed over a pot of gently simmering water (creating a double boiler), melt the chopped sugar-free chocolate with the remaining tablespoon of butter, stirring until it's completely smooth and shiny. Drizzle this melted chocolate generously over your chilled caramel-pecan clusters.
For an extra touch, sprinkle with a little more sea salt if you desire. Let them set completely at room temperature, in the fridge, or freezer, then enjoy your homemade, healthy keto turtles!