In small saucepan, saute onion in oil until transparent. Add tomato juice, brown sugar, vinegar, and cayenne; bring to a boil. Lower heat and simmer barbecue sauce, uncovered, 10 minutes. Wash potatoes but do not peel. Cook in small amount boiling salted water until tender; drain. Seed and cut green pepper into 16 pieces. Cut each onion into 4 wedges. Alternate potato, green pepper, Spam, mushrooms, and onions on long skewers. Place on broiling pan; brush with barbecue sauce. Broil at least 3 inches from heat source 15 minutes, turning and brushing with sauce after 5 and 10 minutes. This recipe yields 8 skewered kabobs. Source: "Official Spam website at http://www.spam.com" S(Formatted for MC5): "10-11-1999 by Joe Comiskey - jcomiskey@krypto.net" Yield: "8 kabobs" Per serving: 682 Calories (kcal); 29g Total Fat; (36% calories from fat); 13g Protein; 100g Carbohydrate; 0mg Cholesterol; 38mg Sodium Food Exchanges: 3 1/2 Grain(Starch); 0 Lean Meat; 6 1/2 Vegetable; 0 Fruit; 5 1/2 Fat; 1/2 Other Carbohydrates Recipe by: n/a Converted by MM_Buster v2.0n.