In a large bowl, blend together the cooked sweet potatoes and butter until creamy.
Add the grated orange zest, brown sugar, molasses and lemon juice. Blend until combined.
Add the salt, baking soda, cinnamon, allspice and flour to the sweet potato mixture.
Blend on low until completely combined.
Switch to a wooden spoon and stir in the chopped pecans.
Drop the batter by tablespoons onto a parchment lined baking sheets.
Bake in a preheated oven for 15-17 minutes, rotating cookie sheets half way through baking.
Remove the cookie sheets to a cooling rack and allow the cookies to cool.
*Note - the cookies will firm up a little upon cooling but they will still be soft and chewy.
Notes
Store cookies in an airtight container at room temperature for 5 days.Store cookies in an airtight container in the refrigerator for up to 10 days.May be frozen. Store cookies in an airtight freezer container or freezer bag. Label and date. Freeze for up to 3 months. Thaw in the refrigerator overnight.