How can I append each element of the RHS list to each element of the LHS list?

Example:
a =. 1 2 3
b =. 10 20 30

I would like a to achieve: a <something> b that will result in:
1 10 1 20 1 30
2 10 2 20 2 30
3 10 3 20 3 30



I have experimented with ,. and ,: without success.

What did I miss?

Yoel
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