Combine first 6 ingredients to make sauce. Set aside. For grits, bring liquid, butter, salt and pepper to boil. Slowly stir in grits. Reduce heat to medium-low; cook, covered about 5-7 minutes or until thickened. Stir occasionally. Remove from heat. For shrimp and sausage: In a large nonstick skillet, brown sausage in 1 teaspoon oil. Remove and keep warm. In same pan, heat remaining oil over medium heat. Add celery and cook 2 min. Add onion, cook for 2 more min. Add garlic and cook for 1 minute. Gradually whisk in sauce mixture. Bring to a boil, stirring constantly. Cook and stir for 2 minutes or until thickened. Stir in shrimp and sausage. Cook on medium-low for 3-5 minutes or until shrimp turn pink. Stir frequently. Serve over grits.