Cucumber Aspic

2 Packages lemon gelatin
2 Envelope unflavored gelatin
1/2 Teaspoon salt
4 Cucumbers, peeled
2 Tablespoons lemon juice
2 Teaspoons chopped onion
1 Cup mayonnaise
Mix the lemon gelatin and the unflavored gelatin with salt and 1 cup boiling water. Stir to dissolve the gelatin. Put the cut-up cucumber in a blender with lemon juice and onion. Blend until blended and add to the gelatin. Pour into a mold and chill until firm. Serve with mayonnaise. 8 servings.