Place the sweet potatoes in a large pot of water, cover the pot and bring to a boil. Remove the lid, lower the heat to medium and cook until the potatoes are tender when pierced with a fork. Drain the potatoes and place them in a large bowl. Using a hand-held electric mixer, break up the potatoes. At low speed add the sugar, milk, cinnamon, allspice, nutmeg, cloves, eggs, salt to taste, and combine.