To perform this interaction related to your career as Barista, your Sim's Career level should be at level 2. This is fast and easy to complete, particularly for those who just started the Barista Career.
"Make a perfectly foamed latte" in the Barista Career
Gold Sack, Career Token, Simoleon, SimCash
1. Go to the Coffee Bar
Head to the coffee bar located in the Parkside and tap on the pink star icon. If you just started the Barista Career, perform at least 2 events to level up. You might need to recharge your motives after doing some events.
2. Start brewing coffee.
Once you have the required level and motives, tap the pink star icon to show up the available events and interaction. "Make a Perfect Foamed Latte" interaction is unlocked and highlighted. Select that interaction and perform it.
3. Wait Till You Receive your Rewards.
This is different from doing an event since you will not need to fill empty star containers. All you have to do now if patiently wait for your Sim's to finish doing the interaction. This will only last for 10 seconds. Tap on the gold check mark to claim your rewards.