This cake is a unique and delicious way to use up any leftover strawberry rhubarb jam. The cake is moist and tender, with a sweet and tangy flavor that is perfect for dessert or a snack. To make the cake, mix together flour, sugar, baking powder, and salt. Add in melted butter, milk, and eggs, and mix until smooth. Fold in the strawberry rhubarb jam and pour the batter into a greased baking dish. Bake until golden brown and enjoy warm or at room temperature.