We should finish up with ham steaks

At a butcher's shop

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Jane: Mario, what are you doing?
Mario: I'm making a shopping list. Now, this is what we need, Jane;
four pounds of stake.
Jane: Four ponds, Mario; that's too much, half a pound.
Mario: Jane, that's too little. We'll get three pounds.
Jane: Two.
Mario: Two, then we'll get six chicken breasts, six chicken legs and
six pork chops.
Jane: How many?
Mario: Six.
Jane: Mario, why six?
Mario: Four for me, two for you.
Jane: Ha!
Mario: And then I think we should finish up with ham steaks.
How many do you want to get.
Jane: Just one.
Mario: One! That's not enough, Jane. We'll get four ham steaks.

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What does "we should finish up with ham steaks" mean?

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