function Vehicle_OnProduce(producer, user, menuitem)
    
     local menu = menuitem + 1

--Just so you know menuitem is a number not a name... So that needs to be a number. 
    if (menu == "Insert the Menu number here.") then
        if (user:inventory_find("Explosive Parts") >= 5) and (user:inventory_find("Energy Particles") >= 50) then -- If they have 5 and 50...
            user:inventory_modify("Explosive Parts",-5)
            user:inventory_modify("Energy Particles",-50)
            user:inventory_modify("Frag Grenade",1)
            return false
            -- OPersonally if you want to make this easier get rid of the inventory_moify and make the production menu give a frag grenande and make it return true.
        else
            user:message("&You need 50 Energy Particles and 5 Explosive Parts to complete a Frag Grenade.")
            return false
        end
    end
    return true
end