Reference jinja var in jinja for salt mine string

gistfile1.py

##
## Using the mine data, we are trying to find the IP address of all servers 
## with roles: mod-cluster-node in the same environment as this minion.
##

 
# EXAMPLE A: THIS WORKS - but we are hard-coding the minion's environemt (development). We don't want to hard-code
{%- for server, addrs in salt['mine.get']('G@roles:mod-cluster-node and G@environment:development', 'network.ip_addrs', expr_form='compound').items() %}
# ... do stuff... 
{%- endfor %}

# get this minion's environment (examples: development, test, stage, production)
# Used for the following examples
{% set minion_environment = grains['environment'] %}

# EXAMPLE B: THIS DOESN'T WORK - how can I reference var "minion_environment" value here?
{%- for server, addrs in salt['mine.get']('G@roles:mod-cluster-node and G@environment:{{ minion_environment }}', 'network.ip_addrs', expr_form='compound').items() %}
# ... do stuff... 
{%- endfor %}

# EXAMPLE C: Doesn't work either
{%- for server, addrs in salt['mine.get']('G@roles:mod-cluster-node and G@environment:minion_environment', 'network.ip_addrs', expr_form='compound').items() %}
# ... do stuff... 
{%- endfor %}

# EXAMPLE D: - now we're talkin'!
{%- for server, addrs in salt['mine.get']('G@roles:mod-cluster-node and G@environment:'~minion_environment, 'network.ip_addrs', expr_form='compound').items() %}
{%- for addr in addrs %}
Allow from {{ addr }}