Put all sweet potato puree ingredients into the bowl of a food processor and process until smooth and creamy.
Spread into a 2 quart baking dish
For the topping:
Put pecan pieces on a baking sheet and bake at 350 degrees F for 10 minutes.
Remove from oven and mix in 1 tablespoon butter.
Spread nuts on top of sweet potato puree.
Sprinkle brown sugar on top of pecans.
Bake at 350 degrees F for about 30 minutes.
The brown sugar should be melted . If there are any spots of sugar that are not melted, brush with a little more melted butter and return to the oven for a few more minutes.
Notes
To bake sweet potatoes: Wash sweet potatoes and prick with a fork. Wrap each in foil and bake at 350F until very tender, about 1 hour.
To microwave potatoes: Place on a dish and microwave until soft. When the middle is squeezed, it should be very soft. Smaller sweet potatoes take about 8 minutes, large sweet potatoes will take a little longer.