I am firmly of the opinion that plates should be made of ceramic, not glass screens. The chef's decision to serve hot soup directly on a tablet is utterly ridiculous. I was sorely tempted to just drink the broth straight from the tureen!

Firmly of the opinion is a strong, fixed phrase used to express an unwavering belief.

Utterly ridiculous is an adverb-adjective collocation meaning completely or absolutely absurd. ("Highly" is not typically paired with "ridiculous").

Sorely tempted is a specific collocation meaning you have a very strong desire to do something you probably shouldn't.