Lefse is typically served dry which allows each person to top the lefse as they desire.
Most often the lefse is cut in half or in quarters and stacked on a platter (my grandmother fanned out the pieces of lefse like a fancy stack of napkins). Each person can take a piece of lefse and top it as desired before eating.
The most common way to eat lefse is to butter it, sprinkle with sugar or brown sugar, and roll it up (although some people fold in half instead of rolling). Other variations are
*plain butter
*spread with jam (lingonberry), jelly, or peanut butter
*topped with lutefisk