1: Don't use Jazz Sprite Dynamite.
2: Suppose for the sake of simplicity that your food sprite is in animation 0 in anim set 0 in your custom j2a file. Then there are various approaches you could take, but these two are probably the most practical.
Code:
jjAnimSets[ANIM::CUSTOM[0]].load(0, "myCustom.j2a");
//option 1: affects only apples
jjObjectPresets[OBJECT::APPLE].determineCurAnim(ANIM::CUSTOM[0], 0);
//option 2: affects any object that might try to use the apple animation
jjAnimations[jjObjectPresets[OBJECT::APPLE].curAnim] = jjAnimations[jjAnimSets[ANIM::CUSTOM[0]]];
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