We have done this for so long it seems odd to add sugar to anything these days.
It should be no added sugar. We also tend not to eat fruit but to eat a lot of veg. It is of no great benefit when you eat tiny tomatoes like sweets though 
If you do try it for Lent start now by looking at what you physically add sugar to: hot drinks, cereals, etc. Then look at what foods you make or buy that are sugary, cakes, bars, chocolate. Remember cereals and ready meals in that list. Then look at the fruit you eat. Some is far more 'sugary' and has less fibre. Apples and pears are better than watermelon, for example.
If you make a 2 column list: 1 with the sugary food in it and the next either a replacement food or a X, for foods you don't really need, you'll be surprised at how easy losing a lot added and refined sugar can be.
We aren't uber healthy or food fanatics, but we both have metabolic diseases in our close family and, out of knowledge and fear on my part, I worked at it until we just no longer have a sweet tooth. We do have chocolate in the fridge, very dark, eaten by the single square (I have no idea how we manage to make 1 bar last for more than a week, it doesn't seem possible).