Rhubarb curd slice | that's life!

Ingredients

• 1 bunch rhubarb, chopped
• 1 ¾ cup caster sugar
• 1 ¾ cups plain flour
• 120g butter, chopped, at room temperature
• 1 tablespoon milk
• 4 eggs few drops of red food colouring, optional
• 2 teaspoons vanilla extract
• Finely grated zest and juice of 1 small lemon