Cut 75 g rhubarb into 8 cm lengths and halved, cut the rest (100 g) into 2 cm pieces
Put eggs and sugar into mixing bowl
Whisk for 2-3 mins, doubled in size
Whisk in lemon zest and custard
Fold in flour until just combined
Carefully fold in chopped rhubarb
Pour into tin
Gently lay rhubarb on top and bake
Bake for about 1 hour, you may need to cover after 30 mins to prevent the rhubarb burning