Press your lips together, add vocal cord vibration, then release.

Americans pronounce burger as BUR-ger (/ˈbɜrgər/). Stress falls on the first syllable — keep everything else short and quick. You'll hear it in sentences like "Serve the worst person the worst burger".
Record yourself saying "burger" and play it back. The mic stays on your device — nothing's uploaded.
2 syllables, 4 sounds. Tap a syllable to jump to its row, then explore each sound's mouth shape and how it's made.
The textbook way isn't wrong — it's just not how anyone actually says it.
Stress falls on the first syllable, not the others. Stretch BUR — keep everything else short and quick.
Americans use a relaxed retroflex R — the tongue curls back rather than rolling. The R is one continuous sound with the vowel before it, not two separate sounds.