Chili Beef Tacos

• 25 pimento-stuffed green olives
• 20 taco shells
• 6 garlic (cloves)
• 4 seeded tomatoes (chopped)
• 2 jalapeno chilies
• 1 onion (chopped)
• 1/2 bunch romaine lettuce
• 1,100 gr stewing beef (cut into)
• 525 gr italian tomatoes (plum)
• 475 ml beef broth