Step 1

Lightly grease a normal sized drinking mug (11 to 12 oz) and set aside. Straight sided mugs work best for this recipe.

Step 2

Make the frosting. In a small bowl mix the powdered sugar with either water, milk, or lemon juice. Add it a teeny tiny bit at a time. You won't need more than about ¾ teaspoon. Stir well until smooth, thick, and drizzle-able then set aside.

Step 3

In a small bowl add the flour, baking powder, 1 tablespoon of the sugar, and salt. Add enough water gradually, stirring between each addition, to form a slightly tacky dough. Use your hand to knead it a couple of times to bring it together.

Step 4

Sprinkle a clean surface lightly with flour. Turn out the dough and sprinkle the top with a little flour. Roll the dough out into a long strip about 4 inches wide and ⅛ inch (2 to 3 millimetres) thick.

Step 5

Sprinkle the strawberry pieces all along the dough leaving a clear margin of about an inch all around the edges. Then sprinkle the strawberries with the remaining sugar.

Step 6

Fold the edges on the longest sides inwards so they meet each other in the middle. This helps to seal the strawberries and sugar in and stop them dropping out when you lift it after rolling. See my video below for a full tutorial. You will be left with a long narrow strip.

Step 7

Roll the strip up then gently lift it and put it into the mug. Pour over ½ a teaspoon of water (important for steam) then place in the microwave uncovered and cook on full power for around 1 min 10 seconds. If it needs longer cook in 5 second increments to avoid overcooking. My microwave is 1200 watts. You will need to adjust the time a bit up or down depending on the wattage of your own microwave. The first time you make this it will be a bit of a case of trial and error. All microwaves are different so be careful not to overcook it as it will become tough.

Step 8

When you open the door it should have puffed up a lot and nearly reached the top of the mug. It will still look pale and a little damp as it's microwaved not baked, so don't think it's underdone and cook longer than you need to or it will overcook. You can check doneness with a toothpick or skewer. Stick into the roll and it should come out clean.

Step 9

Turn out of the mug onto a plate. You might need to give it a little hand with a knife up the side of the mug.

Step 10

Pour over the frosting and serve immediately. Do not leave it to cool. It needs to be eaten freshly cooked, and be careful (especially when serving it to children) because the strawberries will be very hot.