This coffee cake is perfect for a lazy Sunday morning or a brunch with friends. The combination of sweet strawberries and tangy rhubarb makes for a delicious and refreshing cake. To make this cake, you will need flour, sugar, baking powder, salt, butter, eggs, vanilla extract, milk, fresh strawberries, and rhubarb. Mix the dry ingredients and then add the wet ingredients to make the batter. Fold in the chopped strawberries and rhubarb and pour the batter into a greased baking dish. Top with a streusel mixture made with flour, sugar, butter, and cinnamon. Bake for 45-50 minutes until golden brown. Serve warm with a cup of coffee or tea.