Combine Strawberries, agave, vanilla, and lemon juice in a small pot.
Cook over medium heat, stirring frequently and breaking up strawberries for about 5 minutes.
Strawberries should be soft and easily mashed.
Strain strawberry mixture into bowl using a mesh strainer.
Press strawberries to get as much of the juice and syrup out as possible. Place left over strawberry mash aside to use in smoothies later.
Pour strawberry sauce back into pot and bring to a boil, stirring frequently, reduce heat and simmer 5 minutes.
Use warm or refrigerate.