Many Orthodox priests ask that no food be offered as they, like many of us, are watching their weight. The time he comes would actually determine what would be appropriate. In some cultures, it is an affront if food is not offered and at least nibbled by the priest during one of these visits, however in most American parishes this is getting less common. If he is married and he is coming in the evening, you may want to ask if he and his wife could come to dinner so you may get to know them better. That way you have a dual puprose in the visit. Our priest asks at Theophany house blessings that we have a glass of water available but no cake , cookies, or other food. As he travels 55 miles to get to us we usually have a couple of bottles of cold spring water for him to take with him --- by the end of the day of traveling to bless the homes of all of the outlyers he will have traveled 300-400 miles. We also donate to the church fund noting it is for gas/travel expenses for him. He declines personal gifts or personal honorarium.