Risotto with shrimp

2 (8 ounce) bottles clam juice 3 cups water 1 tablespoon olive oil 1/4 cup minced shallot 1 1/2 cups arborio rice or 1 1/2 cups other short-grain rice 1/3 cup[...]

2 lbs large shrimp , peeled and deveined 1 teaspoon dried marjoram , divided 1 teaspoon salt , divided 1/4 teaspoon pepper , divided 2 tablespoons olive oil 4[...]