2 Small cantaloupes 3/4 Cup cava (Spanish sparkling wine) or other dry sparkling wine 3 Tablespoons orange marmalade 1/2 Bunch mint -- washed and julienned Cut off top and bottom poles of melons. Place one cut side against cutting board and slice off rind in segments, cutting smoothly from top to bottom. Repeat with second melon. Halve melons lengthwise and scoop out seeds. Cut flesh into 1inch wedges, then cut wedges crosswise at an angle into diamonds or triangles. In a small bowl, whisk together remaining ingredients. Pour over melon. Stir gently, cover, refrigerate and let macerate for 46 hours. Serve cold. 10/21/96 show