Clean the mussels and boil in 2 cups of water for at least 2 to 5 minutes.
Let the mussels cool. Drain and remove the beard. Set aside.
Heat the olive oil in a pan.
Sauté the onion until soft
Add the garlic and continue to sauté for 1 minute.
Add the tomato and tomato paste. Sauté for 1 minute. Transfer to a bowl and let cool.
Meanwhile combine breadcrumbs, parsley, mint, and lemon juice. Mix well.
Scoop the sautéed onion, garlic, and tomato mixture and arrange on top of the mussels. Add the breadcrumbs mixture above.
Heat the grill and grill the mussels for 5 to 7 minutes in medium heat.
Transfer to a serving plate.
Serve as an appetizer.
Share and enjoy!