I don’t know the practices and customs of other Orthodox countries, but in Greece many laity try to observe what is called the “three-day” (trimero), the first three days of Great Lent, by abstaining from all food and drink. From what I gather it is a custom always practiced in Orthodox monasteries. I’ve been told it used to be kept for the first six days in earlier times.
The idea behind it is to enter the Fast as strictly as possible, fasting from all food and drink the first three days then on Wednesday communing at the first Pre-sanctified Liturgy of Great Lent. In Greece the Pre-sanctified Liturgies are celebrated on Wednesday and Friday mornings.
For those who are unable to abstain from all food and drink I know it is also customary to eat flat bread (something the bakers make special for “Kathara Devtera”, Clean Monday) and halva. Others who try to keep the three-day a bit more strictly eat some nuts and drink some juice in the evenings. Others fast from food but take drink throughout the three days. I’ve heard that it is common to at very least not eat cooked food on Clean Monday, (hence the flat bread and halva). I suppose people fast as strictly as their strength and health allows them. But as our priest said this morning, “For those who can keep the ‘three-day’ they will find it makes the rest of the Fast much more manageable.”
However you observe the first three days of the Great Fast I wish you all good strength and a productive Lent! May we contend well so that we will be found worthy to ascend with Christ to Golgotha, and see His Holy Resurrection!
And on this day of Forgiveness Sunday I’d like to take the chance to say forgive me.