Old Spaghetti Factory Creamy Pesto Dressing

1 cup salad oil
1/2 ounce sweet basil leaves
1/8 Teaspoon tabasco
1/4 rounded tablespoon salt
1/4 slightly rounded (big) cook spoon granulated garlic
1 − 32 Ounce jar mayonnaise
2 1/2 cups buttermilk
1/2 cup half and half
1/2 Pound grated Romano cheese
Combine ingredients in order given. Store in refrigerator. Makes 2 quarts