Put the miso and water in a mixing bowl and blend them together into a slurry without lumps. Wash and chop the strawberries into chunks then toss them in the miso liquid along with the sugar. If your strawberries are a bit watery and flavourless add more sugar and taste to make sure they are sweet. Set aside to macerate.
In another mixing bowl, beat the eggs, milk, vanilla and sugar until well combined. Chop the bread into small squares then throw them into the egg-mix, jostle them around so they are totally coated, then - if you're not scared of raw egg - taste a piece just to make sure the flavours are balanced.
Now's the hard part - the waiting. Leave the bread and strawberries to soak for 30 minutes. It's a long time, yes I agree, but believe me, so worth it!
Meanwhile, so you can keep yourself busy, make the streusel. This is a really quick streusel: rub the ingredients together with your finger tips until it all resembles fine breadcrumbs.
Preheat the oven to 180°C/160°C fan/350°F. Grease 6 holes of a muffin tray.
Pour the strawberries and all the miso and juice into the bread mixture and gently combine. Use your (clean) hands for this, it's the only way. It will look like a lot of French toast but it will all squeeze into the muffin holes, I promise!
Divide the bread and strawberries between the muffin holes and squash them together. Top with the streusel then bake for 25-30 minutes until the bread and streusel are lovely and golden. Serve with maple syrup, yoghurt, Nutella, and enjoy your luxury bruncheon.