A fruit butter is a healthy topping for toast, oatmeal or muffins. Making your own during the times when your favorite fruits are in season can be an inexpensive way to stock up for the year. A good fruit butter is thick enough to spread easily; you don't want it to drip from the spoon or knife. Getting it to thicken up requires a bit of patience and a watchful eye, but it is easy to do.
Remove the lid from the pan. If you've been cooking your fruit butter with a lid in order to keep the flavor in, it's time to take it off. Keeping the lid on can trap the moisture inside, causing the butter to remain runny.
Puree the butter with a stick blender. This will mix any moisture in the pan into the solid fruit.
Allow the butter to continue simmering on the stove.
Check the butter every 15 minutes for the correct texture. Take a spoonful out and place it on a paper plate. There should be no water seeping around the edges of the dollop.
Continue the process until the butter thickens to the correct consistency.