Sandwich Babi Teriyaki

Bahan-bahan (8 porsi)

• 3 lbs daging babi panggang, pantat boston ($7,96)
• 1 sweet onion (medium, $0.53)
• 1 cup saus teriyaki ($1,99)
• 15 oz can pineapple slices ($1.27)
• 1 inch fresh ginger (optional, $0.13)
• 3 Tbsp all-purpose flour ($0.02)
• 8 sandwich buns (or pack hamburger, $1.50)