Preheat the oven to 350 degrees Farenheit (175 degrees Celcius or 170 degrees Celcius for fan ovens).
Grease a 2 pound loaf pan well (approximate dimensions are 8 x 4 x 2 inches).
Sift the flour, baking powder, salt and ginger into a medium bowl,. Set aside.
In a large bowl, whisk together the yogurt, sugar, eggs, rhubarb flavouring or vanilla and the olive oil until well mixed.
Add the dry ingredients to the wet ingredients in three additions, whisking between additions. Whisk the batter until smooth and well combined.
Pour the batter into the loaf pan and bake for 40 to 50 minutes, or until a cake tester inserted in the centre of the loaf comes out clean.
Meanwhile, prepare rhubarb compote.
Put the cut up rhubarb, sugar, orange juice and zest into a saucepan.
Bring to the boil, stirring frequently.
Turn back the heat and simmer for about 8 minutes or until the rhubarb is soft but not falling to pieces, stirring occasionally.
Remove from the heat and carefully pour into a pyrex bowl to cool a bit.
Strain the compote so that you have the syrupy juices separate from the rhubarb. You will be using this syrup to drizzle over the cake.
When the loaf cake has finished baking, remove the loaf pan from the oven to a heat safe surface.
Carefully poke the top of the loaf cake with a skewer so that there are several small holes all through it.
Reserve 3 tablespoons of syrup for the glaze.
Drizzle about 10 tablespoons of the remaining syrup (or whatever is left, but not more than the 10 tablespoons) over the cake.
Leave the cake in the loaf pan to cool completely.
Store the cooled rhubarb compote in the fridge. You may want to serve it alongside the cake, or you may wish to use it for other purposes.
When the cake has cooled completely, you can remove it from the loaf pan and glaze it.
To make the glaze, stir 2 to 3 tablespoons of rhubarb syrup into the icing sugar, adding a bit of water if you need more liquid, until you get a drizzle-able glaze.
Drizzle the glaze over the loaf cake and allow to set before cutting and serving.