None of those alternatives are really much cheaper than dumplings:
Bowl of Prickly Pear Sorbet: 35s 81c + 112 karma buy offer ingredients, 47s 6c + 112 karma insta-buy ingredients (30 minutes)
Plate of Roasted Cactus 67s + 175 karma buy offer ingredients, 86s 20c + 175 karma insta-buy ingredients (1 hour)
Loaf of Candy Cactus Cornbread: 11s 69c buy offer ingredients, 12s 59c insta-buy ingredients (30 minutes)
Other just plain boon duration food:
Chocolate Omnomberry Cream: 8s 38c buy offer, 9s 96c inst-buy (30 minutes)
- 40% magic find while under the effect of a boon
- 20% Boon duration
Chocolate Raspberry Cream: 40c buy offer, 81c insta-buy (30 minutes)
- 32% magic find while under effect of a boon
- 14% Boon duration
In daytime fractals there are also these:
Ghost Pepper Popper: 3s 5c buy offer, 5s 5c insta-buy (30 minutes)
- 40% chance to cause might for 5s on critical during the day (1s ICD)
- 40% chance to cause chill for 1s on critical during the night (1s ICD)
As everyone else has said, all of these are not particularly good alternatives.