Rhuburb Upside Down Cake

• 650 rhubarb
• 75 sunflower margerine
• 20 cm greased
• 2 1/2 cm lengths
• 1 egg yolk
• 1/2 sugar
• 95 gr self raising wholemeal flour
• 85 gr muscovado sugar (light)
• 24 gr butter
• 16 gr almonds (ground)