If you take the rooks movement, and reduce each longer move to a series of single steps a1a2a3a4 for example, this becomes a Hamiltonian problem. The corners have 2 nodes, the edges three, and the core has four. Black and white indicates even or uneven distance in nodes.
1 Lb beef : $10.00 20 ea Tortilla: $7.00 Garlic 1oz: $1.00 Cumin: $1.00 Oil 2 oz: $2.00 Cheese: $6.00 Sour cream 10 oz: $3.00
Total: $30 For Ea 20
$1.50 is that floor for a good one of these. Bulk pricing and cheap labor could make this price possible. I think 3 is what a person might pay. PS not a chef, not a finance person.