Peel the sunchokes with a sharp small knife or using the sides of a spoon. Put them immediately into a bowl of water with lemon juice in it so they do not get dark. If they are large cut them into half.
If you choose to add potatoes peel and cut to similar sizes.
Peel and dice the carrots.
Slightly heat the olive oil in a pressure cooker if you have one, if not in a pot. Add chopped onions and cook for 2-3 minutes until they are translucent, then add chopped garlic cloves and stir for an additional minute.
Rinse the sunchokes and potatoes and add to the onions. Also add the carrots, stir for a minute.
Add the salt, sugar, half a lemon's juice and half an orange juice.
Add enough warm water to cover the bottom of the pot.
When the water boils add rinsed rice if you decide to use it.
Cook with first high, and then low heat until the sunchokes are ready. Test with a fork. They cook pretty fast.
Keep the lid covered while cooking. Also after removing from the heat, keep the pot covered until the pot cools down.
Serve chilled, garnish with chopped dill or parsley and lemon wedges.