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I'll try :).

oishkatta dakedo mada onaka ga suita [suiteimasu?] - It was tasty but stil I am hungry.

jisai mecha oishkatta yo.
I am not sure about this .. but it could be 'jisai meshi ga oishkatta yo.'
-Actually, the food was tasty.

Correct me if I am wrong.

When you write mecha めちゃI guess maybe you mean metchaめっちゃ, which is a slang way of saying totemo とても("very").

I don't know about jisai, thuogh.

Try jissai.