To make meat soboro : Put all ingredients (ground meat, ginger, soy sauce, sake, water, mirin and sugar) in a pot. Mix well with a whisk.
Set the pot over the medium heat and keep stirring the meat mixture.
Keep stirring until the liquid is almost evaporated.
To make scrambled egg with microwave oven: Add all ingredients (eggs, sugar, mirin and salt) to microwave safe bowl. Put the bowl in the microwave oven and cook for about 1.5 minutes with 750w. Take the bowl out from the microwave oven and stir with a whisk.
Put it back in the microwave oven and cook 15 - 30 seconds again. Remove the bowl from oven and stir with a whisk. This repeats until the egg mixture becomes scrambled egg. Be careful not to overcook. If you cook too long, the some part of the eggs will turn grayish.
Put frozen green peas in a microwave safe bowl and cover with cling film. Cook for one minute with 750W. Check if the green peas are cooked. If not, cook further 10 – 15 seconds.
Put the rice in a bowl and arrange soboro meat, egg and green peas on top of the rice.