Carrot Steaks with Roasted Garlic Hollandaise

Name: Carrot Steaks with Roasted Garlic Hollandaise
Ingredients: 4 extra-large carrots without tops (about 2 pounds), halved lengthwise; 1 tablespoon grapeseed oil; 1 1/4 teaspoons kosher salt, divided, plus more to taste; 1/2 teaspoon black pepper, plus more to taste; 1 lemon, halved crosswise and seeded; 3 medium-size unpeeled garlic cloves; 2 large egg yolks; 1/2 cup unsalted butter (4 ounces), melted and hot; 1 teaspoon water, or more as needed; 1/4 cup salted roasted pistachios, chopped