German · Pronunciation Guide
SHTARK. At the start of a word st is always 'sht', and the r colours the a before the final k.
The comparative stärker fronts the vowel to ä without moving the stress at all. The word is also a grammatical term in German — starke Verben are the strong verbs — which is a small piece of trivia that makes the adjective easy to remember once you have met a few of them.
Listen: stark
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Der Kaffee ist sehr stark.
The coffee is very strong.
Listen: Der Kaffee ist sehr stark.
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Der Kaffee ist sehr stark contains a perfect minimal contrast: ist ends in a plain st, and stark begins with a 'sht'. The two sit right next to each other, so you can hear that the rule is about position rather than about the letters themselves.
Pronouncing the opening as a plain st is the standard beginner reading, and it is worth fixing early because sp- and st- words appear constantly. Say sh, then t. The r is the second matter: keep it at the back of the throat, where it merges with the vowel, rather than curling the tongue as an American speaker would.