Vegan Fettuccine Alfredo (No Cashews!)

Name: Vegan Fettuccine Alfredo (No Cashews!)
Prep time: 10 min
Cook time: 20 min
Total time: 30 min
Cuisine: Italian
Ingredients: 6 oz fettuccine pasta; 3 tbsp vegan butter or margarine ((or 2 tbsp olive oil)); 1 tbsp all-purpose flour; 1 cup unsweetened oat milk (storebought, SEE NOTES); 4 cloves garlic (minced); 4 tbsp nutritional yeast; 1/4 teaspoon nutmeg; 2 teaspoon lemon juice; 1/2 teaspoon vegan lactic acid (or 1 tsp more lemon juice); salt and pepper to taste; 1 handful chopped fresh parsley (garnish)