You can read story with more context here
Story is in "Ramakrishna as we saw Him" by Swami Chetanananda
As you said, it is a reminiscence by Ramlal Chattopadhyay (Sri Ramakrishna's nephew)
is on page 57, 3rd edition (2008)
Here you have link
After Sri Ramakrishna's Passing Away
A young Ramait monk [a worshiper of Ramachandra] in Ayodhya had a
vision that God had again incarnated on earth, somewhere m the east.
In order to see him, the monk started on foot eastward from Ayodhya.
When he reached Bengal he heard that there was a great saint named
Sri Ramakrishna near Calcutta. He finally found Dakshineswar after a
long search and asked someone, "Where is Ramakrishna Para- mahamsa?"
The people of the Kali temple told him that the Master had just
passed away a few days before. Hearing this heartbreaking news.
the monk exclaimed: "What! He passed away? I have come from Ayo- dhya
on foot [nearly a thousand miles] just to see him. I went through so
much hardship to get here and he has left the body!" The young monk
began to sob.
The manager of the Kali temple offered him some food from the temple
store but he refused it. He went to the Panchavati and stayed there
for two or three days without eating. One night Sri Ramakrishna
appeared before him and said: "You have not eaten anything for several
days. I have brought this pudding for ycu. Please eat it." He fed the
monk and disappeared.
Thi next morning I went to the Panchavati and found the monk full of
joy. I asked: "What happened? You were so unhappy yesterday. Why are
you so cheerful toda)?" Then he told me everything. He even showed me
the earthen bowl in which the Master had brought the pudding. [Ramlal
preserved that bowl for a long time , but somehow it was destroyed.]
(Udbodhan , vol. 49, no. 10)
[From: Sri Ramakrishna O Antaranga Prasanga, by Kamal Krishna Mittra (Dakshineswar: K. K. Mittra), 1932; Udbodhan (Calcutta: Udbodhan Of¬
fice), vol. 49, no. 10,1947]
