「just」と「only」の使い方

The other day for lunch I cooked this fried rice. I used Indian spices in it, though, to make it more exciting. I also used a Chinese cooking ingredient, chili pepper flakes soaked in oil. I had never used that ingredient to make fried rice before.

× I just only imagined that it would be good.
○ I just imagined that it would be good.
○ I only imagined that it would be good.

Usually we do not use "just" or "only" together. Basically, they have the same meaning, so we have to choose one of them.

One exception is "only just [verb]".

• only just 辛うじて、たった今～したばかり、やっと、今しがた (definition from Eijiro on the Web)

I only just had enough time to make this fried rice before I had to leave the apartment. It's lucky that fried rice is not only easy to make but also delicious. I'd say it's just a perfect dish.