In Islam, there are etiquettes of eating which could be categorized as follows:
1 – Washing the hands before eating.
2 – Mentioning the name of Allah before eating saying “Bismillaah (i.e., in the name of Allah)” when starting to eat. It was narrated from Umm Kalthoom from `Aa’ishah (may Allah be pleased with her) that the Messenger of Allah (peace and blessings be upon him) said: “When any one of you eats, let him mention the name of Allah. If he forgets to mention the name of Allah at the beginning, then let him say ‘Bismillaahi awwalahu wa aakhirahu (i.e., In the name of Allah at the beginning and at the end).’”
And praying or du`a' before eating *"Allahumma baariklanaa fiimaa rozaqtanaa wa qinaa adzaabannar, Allahummaj'alhu rizqon thoyyiban, laa tabi'ata fiihi wa laa hisaaba"*
3 – Eating with the right hand. It is obligatory for the Muslim to eat with his right hand; he should not eat with his left hand. It was narrated from Ibn `Umar (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: “No one among you should eat with his left hand, or drink with it, for the Shaytaan eats with his left hand and drinks with it.”
This applies so long as there is no excuse. However, if a person is not able to eat and drink with his right hand due to some excuses such as; sickness, injury etc., then there is nothing wrong with him if he eats with his left hand.
4 – Eating from what is directly in front of one. It is Sunnah for a person to eat from the food that is directly in front of him, and not reach out to take food that is directly in front of others, or from the middle of the platter. The Prophet (peace and blessings be upon him) said to ‘Umar ibn Abi Salamah, “O young boy, say Bismillaah, eat with your right hand, and eat from what is directly in front of you.”
5 – It is Sunnah before eating to prioritize eating fruit first.
6 – Sunnah to taste salt before eating. Based on hadith; "It was narrated from the Prophet Muhammad shallallahu'alaihi wassalam: (he said to Sayyidina Ali ra.) "O Ali, start your meal by (tasting) salt, because in fact salt is a cure for seventy diseases, including madness, leprosy, stripes, stomachache, and toothache"
7 – Sunnah to recite the words of praise to Allah and du`a’ after one has finished eating. When he had finished eating, the Prophet (peace and blessings of Allah be upon him) used to say, “Al-hamdu Lillaahi ath'amanii haadha to'aam warozaqoniihi min ghoiri haulimminni walaa quwwah.”
8 – The etiquette of eating also includes: eating with a group; not speaking about things that are haram while eating; eating with one’s wives and children; not keeping a particular food to oneself unless there is a reason for that, such as it being for medicinal purposes – rather one should offer the best food to others first, such as pieces of meat and soft or good bread.
9 – Not condemning the food. Abu Hurayrah (may Allah be pleased with him) narrated that the Prophet (peace and blessings be upon him) never condemned or criticized any food. If he liked it he would eat it and if he did not like it he would leave it.
10 – Avoiding eating and drinking from vessels of gold and silver, because that is prohibited. The Prophet (peace and blessings be upon him) said: “Do not wear silk or brocade, and do not drink from vessels of gold and silver, or eat from plates thereof. They are for them (i.e., unbelievers) in this world and for us in the Hereafter.”
11 – Praising Allah after finishing eating. There is a great deal of virtue in this. It was narrated from Anas ibn Malik that the Messenger of Allah (peace and blessings of Allah be upon him) said: “Allah is pleased with His slave when he eats something and praises Him for it, or drinks something and praises Him for it.”
Several ways of praising Allah have been narrated from the Prophet one of them is what Al-Bukhaari narrated that Abu Umaamah said: When the Prophet (peace and blessings of Allah be upon him) finished eating, he would say, “Al-hamdu Lillaah hamdan katheeran Tayyiban mubaarakan fihi ghayra makfiyyin wa laa muwadda’in wa laa mustaghnan ‘anhu rabbana (Praise be to Allah, much good and blessed praise. O our Lord, You are not in need of anyone, and we cannot do without Your favour nor dispense with it).”
