In an article talking about Chinese cuisine, what does 辉煌 describe in 以至辉煌至今?
辉: 

(n) brightness; splendour; radiance

(v) to shine 

煌:  splendid; brilliant; sparkling

辉煌 means ' to shine brilliantly'

Most of the time, 辉煌 is used as a compound, acting as an adjective for: "splendid; glorious; brilliant". 


  什么事情，事物是‘辉煌的‘？这里‘辉煌’的形容词描述了什么？


'辉煌' is an adjective when it is placed before a noun. For example: 'brilliant battle record' (辉煌战绩). 


  '中国饮食辉煌至今' - 
  "Chinese cuisine is still shining brilliantly till today"


In this context, 辉煌 is either acting as a verb phrase: 'shine brilliantly'. In which, 辉 is acting as a verb: 'to shine'; 

Or the sentence just omitted the verb: 'still be' (仍是)

'中国饮食(仍是)辉煌至今' -- 'Chinese cuisine (is still) glorious till today"

look at 'splendid battle record' (辉煌战绩) again,  辉煌 is clearly an adjective because it is placed before the noun 战绩. 

However, in '战绩辉煌', 辉煌 could also be treated as a verb phrase (battle record shines brilliantly) with 战绩 as the subject. 

Or 辉煌 is still an adjective, with the verb omitted in the phrase:  '战绩(非常)辉煌'--  'battle record (is very) splendid'  


  为‘辉煌’


If you want to say: 'for glory', 辉煌 is not the word, because it is not a noun. 

'For glory' in Chinese is '为荣耀'