Clean asparagus & cut into 1 inch pieces. Combine asparagus & 1/4 c. Water in a 3 quart casserole. Cover with plastic wrap, turn back one corner to vent & microwave on high for 5 min. Let stand 3 min. Add remaining 3 cups water, potatoes & bouillon granules to asparagus mixture. Cover with plastic & vent. Microwave at high for 10 min. , Stirring once. Reduce power to medium & microwave 15 to 18 min. Let mixture cool slightly. Pour about 1/3 of mixture into processor & process until smooth. Transfer mixture to a large bowl. Repeat procedure with remaining asparagus mixture. Stir in milk, salt & pepper. Cover & chill about 8 hours. Stir well before serving. Garnish with lemon rind strips.