The confusion is because there could be two ways of looking at what you're trying to do.
1) A specific race that can eat raw food while other races cannot.
2) Any race can eat a specific food raw.
I
think the first isn't possible.
The second can be achieved by going through the plant raws, and adding [EDIBLE_RAW] for each plant.
EX:
[PLANT:MUSHROOM_HELMET_PLUMP]
[NAME:plump helmet][NAME_PLURAL:plump helmets][ADJ:plump helmet]
[USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
[MATERIAL_VALUE:2]
[BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
[EDIBLE_VERMIN]
[EDIBLE_RAW] Here, the plump helmet plant is made edible raw.
[EDIBLE_COOKED]
[PICKED_TILE:6][PICKED_COLOR:5:0:0]
[GROWDUR:300][VALUE:2]
[USE_MATERIAL_TEMPLATE:DRINK:PLANT_ALCOHOL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:frozen dwarven wine]
[STATE_NAME_ADJ:LIQUID:dwarven wine]
[STATE_NAME_ADJ:GAS:boiling dwarven wine]
[MATERIAL_VALUE:2]
[DISPLAY_COLOR:5:0:0]
[EDIBLE_RAW] Here, the plump helmet drink is made edible raw.
[EDIBLE_COOKED]
[PREFIX:NONE]
[DRINK:LOCAL_PLANT_MAT:DRINK]
[PLANT:GRASS_TAIL_PIG]
[NAME:pig tail][NAME_PLURAL:pig tails][ADJ:pig tail]
[USE_MATERIAL_TEMPLATE:STRUCTURAL:STRUCTURAL_PLANT_TEMPLATE]
[MATERIAL_VALUE:2]
[BASIC_MAT:LOCAL_PLANT_MAT:STRUCTURAL]
The actual plant is not edible raw, because there is no [EDIBLE_RAW] tag under the structural portion.
[PICKED_TILE:231][PICKED_COLOR:7:0:0]
[GROWDUR:300][VALUE:2]
[USE_MATERIAL_TEMPLATE:DRINK:PLANT_ALCOHOL_TEMPLATE]
[STATE_NAME_ADJ:ALL_SOLID:frozen dwarven ale]
[STATE_NAME_ADJ:LIQUID:dwarven ale]
[STATE_NAME_ADJ:GAS:boiling dwarven ale]
[MATERIAL_VALUE:2]
[DISPLAY_COLOR:7:0:0]
[EDIBLE_RAW] Here, the drink is made edible raw.
[EDIBLE_COOKED]
[PREFIX:NONE]
[DRINK:LOCAL_PLANT_MAT:DRINK]