A day before you plan to use the vodka, start the infusion: To a large jar or airtight plastic container, add the vodka, olive oil, rosemary, and thyme. Shake vigorously, then set aside at room temperature to infuse for 12 hours.
Transfer the jar to the freezer for another 12 hours (or overnight). This will cause the olive oil to solidify and separate. Place a fine mesh strainer over a second large jar or container, then strain the vodka, discarding any solids. Wash and dry the original jar and the strainer then line the strainer with a coffee filter. Strain the vodka once again to remove any remaining sediment and oil. Use immediately or cover tightly and use within 6 months.
Mix the martini: In a mixing glass filled with ice, add 2½ oz. of the infused vodka, along with the vermouth and salt. Stir until well-chilled, then strain into a martini glass or coupe, drizzle a few drops of MANNI Per Me, and garnish with as many olives as you like. Serve immediately.
Note: For optimal enjoyment it's important to drizzle the MANNI Per Me after shaking and just before serving as shaking the oil with the ice will cause the oil to freeze and solidify.