Did Someone Say Cardamon Muffins?

These muffins are a serious hit in our house, and whenever I make them people ask for the recipe (she says oh-so-modestly). So, with the spirit of recipe sharing foremost in my mind, here it is:

4 cups whole wheat flour
2 tsp baking soda
1.5 cups sugar (you can adjust this)
2-4 Tbsp ground cardamon (I use 4 Tbsp but that might be too much for you)

2 cups milk with a generous splash of lemon juice or vinegar to curdle it
1 egg
2/3 cup of oil 

1 big, fat, peeled, grated, sweet potato

Mix together as you usually do with muffins, then bake in a 375ºF oven until done.