To prepare a strawberry jam cake recipe, first you need to prepare the ingredients for the cake. First, you'll need the following ingredients: 1 cup (240 ml) sugar, 1 tablespoon (14 g) vanilla extract, 2 tablespoons flour, and 2 teaspoons baking powder. You can find these ingredients at your local grocery store. Then, add the wet ingredients to the dry ingredients and mix them together until they're just combined. Now, pour the batter into the prepared cake pan and bake it in the oven for 30 to 40 minutes.