First toast your pecans. This can be done in a shallow frying pan or in the oven. If using a frying pan, place the pecans in the dry pan, over a medium heat and dry fry for about 5 minutes until aromatic and starting to lightly darken. If using the oven, spread the pecans out in a single layer on a baking sheet. Place this in a 350°F (175C/155C Fan) oven for about 7 minutes, again until darkening and aromatic. Remove from the heat and allow to cool completely (about 30 minutes).
Once the pecans are cool, prepare your chocolate for dipping. Place 9 ounces of the chopped chocolate in a small heat proof bowl, fitting snuggly over a saucepan of simmering water (a DIY double boiler). Continue simmering the water, ensuring this never touches the bottom of the bowl. Stir the chocolate until this is melted and smooth.
Remove the bowl from the saucepan and add the reserved 1 ounce of chocolate. Stir this until smooth.
Dip your pecans into the chocolate using a fork to help allow excess chocolate to drip off. Place the dipped pecans on a piece of parchment paper or a silicone baking mat.
Sprinkle with a bit of sea salt and allow to set for about 3 hours.