Place the beetroot in a small roasting pan with 125ml of water
Heat the oven to 200C/400F/ gas mark 6.
Cover and cook for about 1 hour, until tender when pierced with a fork.
Set aside to cool.
Peel and cut the beet root into small dices
Transfer to a bowl and add half the coriander stem, mustard and red onion
Add half the lemon juice and 1½ tbsp oil
Mix well and season to taste.
Cover and refrigerate.
Combine the salmon and the remaining coriander stem and red onions in a bowl.
Add the parsley, and the remaining mustard ,lemon juice and olive oil, season to taste.
Mix well, cover and chill.
Cut the avocado in half, carefully remove the stone and use a large spoon to remove the skin.
Dice into 0.5cm chunks,place in a small bowl and drizzle with lemon juice and a pinch of salt.