Como dizer "Vamos provar" em inglês

Never Land,

Sugiro usar "try".

Let's try...
Can I try...?

With foods and drinks, you can also use "to taste".

Have you tasted the sauce? It's wonderful.
May I have a taste of (May I taste) the soup?

Just a taste = only a small amount/quantity (much like "amostra")
I don't want a large piece. Just give me a taste.
This storm is a taste of the weather we are expecting this winter.
I saw my girlfriend with another man, and I gave her a taste of her own medicine by dating one of her friends.
(a taste of one's own medicine = an example of the bad conduct/actions of another person)

A tradução de "May I have a taste of the soup ?" seria Eu posso provar um pouco da sopa ?

Have a taste of (sth): Provar um pouco de (algo)

E eu posso provar: May I try it ? or May I try that ?

E aproveitando a deixa...... rsrsrsr
Como ficaria a tradução do trecho em itálico:
"She's demanding. Uncompromising. And if she's going to eat what you want.
It better taste good."

Thanks in Advance

Never Land,

A tradução de "May I have a taste of the soup ?" seria Eu posso provar um pouco da sopa ?

Sim, você acertou na sua dedução.

E eu posso provar: May I try it ? or May I try that ?

Sim, está correto.

"It better taste good"= é melhor ser bom, ter gosto bom.

"You'll have the opportunity to sample mouth-wathering local cuisine" (extraído de um livro da série English In Use)

Eu não conhecia "sample" neste sentido!

Sample
to taste a small amount of food and drink in order to see what it is like
We sampled the soup and found the flavour surprisingly delicate.