Place 2 layers of kitchen paper on a flat work surface; arrange tofu slices on top. Cover tofu slices with a baking tray. Place tins, jars or a heavy book on top of the baking tray. Press tofu for 15 minutes. Remove weights and discard accumulated liquid.
Mix lemon juice, tamari and garlic together in a bowl.
Place tofu slices on the baking tray; pour lemon juice mixture on top. Let tofu marinate for 15 minutes.
Preheat a large pan over medium heat; pour in olive oil. Add tofu slices in a single layer. Cover and cook until golden brown on the bottom, 5 to 7 minutes. Flip tofu and continue to cook, covered, until golden brown on the second side, about 5 minutes more. Remove lid and cook uncovered for 2 to 3 minutes. Repeat with remaining tofu.