。
How about vegetable tempura?
Literal
Vegetable tempura [topic-は] how [copula-ですか].
~はどうですか ('how about X?') is a staple polite suggestion/offer pattern. 野菜てんぷら is written with てんぷら in hiragana — a neutral/traditional writing; also written 天ぷら (mixed kanji+kana) or 天麩羅 (full kanji, mostly decorative). Tempura is a Japanese cuisine term, itself possibly from Portuguese 'tempora.'