Sandwich French Dip Slow Cooker (Meleleh di Mulut Anda!)

Bahan-bahan (8 porsi)

• 3 -4 pound chuck roast
• garam dan merica secukupnya
• 2 tablespoons olive oil
• 1 (10,5 ons) kaleng daging sapi consommé
• 1 (14,5 ons) kaleng kaldu sapi
• 1 irisan bawang bombay
• 1 tablespoon kecap
• 2 tablespoons saus Worcestershire
• 8 gulungan hoagie
• 8 slices keju mozzarella