。
Let's make sashimi for dinner.
Literal
Dinner [for-には] sashimi [object-を] make-[volitional-ましょう].
刺し身 (さしみ) is a cultural reference learners probably already know: raw fish sliced thin, eaten with soy sauce and wasabi, typically as an appetizer or centerpiece of a meal. The kanji literally mean 'pierce-body' — from the historical practice of attaching the fish's fin to the slices as a visual identification. Here には frames 夕食 as the purpose/context.