Chọn loại cá ngừ dùng để làm Sushi. Chuẩn bị sốt. Cắt cá ngừ thành các khối vuông nhỏ. Cho cá ngừ vào nước sốt.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Tuna tartare is a dish made with raw ahi tuna. It's a light, refreshing dish that doesn't actually require cooking, but it's one of the most popular ways to prepare the fish. It's important to get sushi-grade tuna if you're using this preparation method, since you won't be cooking the fish to kill parasites and bacteria.  To make four servings of tuna tartare, you need one pound of tuna. Either steaks or fillets will do. This dish is best with fresh tuna, rather than tuna that has been previousl