Sprinke the 1 cup grated cheese, red pepper and green onion into the bottom of a shallow sided dish about 10-inches wide. Place the cream cheese and salsa in a food processor; blend until almost smooth. Spoon cream cheese mixture into the serving dish; spread it out with a spatula until it touches the sides. Place the avocado, lime juice, the 1/2 cup sour cream and sugar in a food processor and pulse until smooth. Carefully spread over the cream cheese ixture, leaving 1/2-inch border. Place the 2 Tbsp. sour cream in a piping bag fitted with a small, plain tip. Pipe the sour cream in a spiral shape over the avocado mixture. Drag the tip of a sharp knife from the centre of the spiral to the edge of the dip. Wipe the knife clean. Move about 1-inch to the left or right and repeat the process. Continue until the whole dip looks like a spider web. Sprinkle outer edges of the dip with remaining cheese.