。
I'm totally sick of restaurant food.
Literal
I [topic-は] restaurant [possessive-の] food [to-には] thoroughly-fed-up-being.
飽き飽きする (あきあきする, 'to be completely fed up, thoroughly tired of') — reduplication of 飽き for emphasis. には combines に (target of weariness) with は (topical emphasis). ~している marks the ongoing state.