What’s the best way to connect the 3/4” gas line to the 3/8” grill hose

I just had a natural gas line installed in the outside wall of my house. It has a valve and a female 3/4” connector. My natural gas grill has a hose with a 3/8” connector. How can I best connect these?

I saw silver male-to-male fittings going from 3/4” to 1/2”. Big box stores didn’t have 3/4 to 3/8. Is there such a thing? An old guy at the store told me a need a bunch of black iron pipes strung together to achieve the reduction but couldn’t explain why. He seemed dubious about a simple double threaded connector. I’d rather not have 7” of lead pipe sticking straight out of the wall if I can avoid it.

My intent is to only have the gas on when using the grill and turn off the supply valve when the grill is not in use (ie most of the time)

Thoughts?

Here's the 3/4" connector (gas line) from the house w/valve:

Here's the threaded 3/8" connector for the hose on the grill:

Just found this from a company selling brewer's supplies:

The thread sizes match what I need but… Does that mean it's OK to use for natural gas??? Doesn't mention what it's made from. My existing connectors both seem to be brass.