Questions & Answers about Рис без соли и сахара кажется не таким вкусным.
The preposition без (without) always takes the genitive case. That’s why you see:
- соль → genitive singular соли
- сахар → genitive singular сахара
With verbs like быть, казаться, стать, a descriptive predicate is often in the instrumental case to indicate a state/quality. The subject is рис (masc. sg.), so the predicate agrees in gender/number and takes instrumental:
- такой вкусный (nom.) → instrumental: таким вкусным. The negation не scopes over таким here: “not so/as (that) tasty.”