Drain the soaked almonds. Place in a food processor with the lemon juice, salt, nutritional yeast, and water. Process until light and fluffy, stopping to scrape down the sides as needed. It's okay to maintain a small amount of almond texture. Add the agar powder to the processor and pulse several times to incorporate.
Transfer the mixture to a small sauce pan. Cook over medium heat for 3 to 5 minutes, whisking or stirring constantly. When you see some bubbling and know the mixture has reached boiling temperature, remove from heat and pour into ramekins or a small bowl. Refrigerate until ready to use. It will be set and ready to use in about 30 minutes.
This cheese can also be made in advance. Once cool, cover and store in the refrigerator for up to 4 days.To freeze, wrap completely so that the cheese is protected from air. Allow to thaw for several hours in the refrigerator before using.