This is the 1309th most frequent Japanese word.
美味しかっ
"美味しかった" means "was delicious."
美味しかった (oishikattta) is used here in past tense adjectival form to describe the tastiness of the ramen.
昨日食べたラーメンはとても美味しかったです。
The ramen I ate yesterday was very delicious.
美味しかった (oishikattta) is used in reported speech to indicate the past observation of tastiness.
その新しいレストランのケーキが美味しかったと言われています。
It is said that the cake of that new restaurant was delicious.
美味しかった (oishikattta) is utilized in the individual's opinion connected with the past tense.