
das Essen
food
The dishes or food items that one eats.
Das Essen in der Kantine ist heute besonders lecker.
The food in the cafeteria is especially tasty today.
food / meal / eating
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food
The dishes or food items that one eats.
Das Essen in der Kantine ist heute besonders lecker.
The food in the cafeteria is especially tasty today.

meal
A meal at a particular time of day, such as lunch or dinner.
Nach dem langen Spaziergang freuten sich alle auf das warme Essen.
After the long walk, everyone was looking forward to the warm meal.

eating
The act of eating itself; taking in food.
Beim Essen soll man nicht mit vollem Mund sprechen.
When eating, you shouldn’t speak with your mouth full.
'Das Essen' (food/meal/eating) is a nominalized verb derived from the verb 'essen' (to eat). Like most nominalizations of verbs, it is neuter (das) and is capitalized.
Das Schwimmen im See macht Spaß.
Swimming in the lake is fun.
When speaking generally about food or a meal, 'Essen' (food/meal) is often used without an article. This is very common in fixed expressions and everyday situations.
Essen ist fertig!
Food is ready!
When 'das Essen' (the food) means the dishes, it is often combined with verbs like 'kochen' (to cook), 'zubereiten' (to prepare), 'bestellen' (to order), or 'servieren' (to serve).
Wir haben für heute Abend italienisches Essen bestellt.
We ordered Italian food for this evening.
The meaning 'Vorgang des Essens' (act of eating) is often signaled by prepositions like 'beim' (while/when), 'vor dem' (before), or 'nach dem' (after). The focus here is on the action, not on the dish.
Beim Essen schaue ich keine Nachrichten.
When eating, I don’t watch the news.
kitchen / cuisine
Here, Essen refers to the specific food someone eats. Küche, by contrast, refers to the typical style of cooking and the range of dishes associated with a country or region. Use Essen when you mean individual dishes; Küche is more suitable for the culinary tradition.

Ich mag das italienische Essen, besonders die frischen Nudelgerichte.
I like Italian food, especially the fresh pasta dishes.
Ich mag die italienische Küche, besonders ihre einfachen Zubereitungsarten.
I like Italian cuisine, especially its simple ways of preparing food.