Attempting a partial mash advice

[Brew2Day]

I was gonna use 1.5kg of LME and then make another 1.5kg with some MO grain. I've only got a 5L pot but I could get another to make 10L total.

It sounds stupid but to get another 1.5kg would I just add 1.5kg of MO to the pot or do I need more?

 

[rodwha]

Can you clarify your question a bit? I'm not following.