Soak the bread in water to cover while you prepare the other ingredients. When it’s soft, squeeze the water from it and put it in a food processor with the garlic, tarama, and a couple tablespoons of lemon juice.
Turn the machine on and add olive oil in a steady stream until the mixture is smooth and creamy. Taste and add more lemon juice, oil, or garlic if you like; you may also add a little salt and pepper. Serve immediately or cover tightly and refrigerate for up to a couple of days before serving.