を食べましょう

let's eat

→ を
phrase Rare #29,826
let's eat を marks what is being eaten; the object is usually named before it. 食べましょう is a polite way to suggest eating together.
JA: ここでお弁当を食べましょう。
EN: Let's eat our lunch here.

今晩は外で食事を食べましょう。

Let's eat out tonight.

外でお昼ご飯を食べましょう。

Let's have lunch outside.

今夜キノコのシチューを食べましょう

Let's have mushroom stew tonight.

— お嬢さん (2016)

お寿司を食べましょう。

Let's eat sushi.

ではごはんを食べましょう

Well then, let's eat.

— 崖の上のポニョ (2008)

外でランチを食べましょう。

Let's have lunch outside.

あそこに座って、お弁当を食べましょう。

Let's sit over there and eat our packed lunches.