Frozen Margarita Pie

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2.5 cup(s) (about 4 ounces) thin salted pretzel sticks

1/3 cup(s) sugar

1 stick(s) (about 1/2 cup) butter, melted

1 can(s) (14-ounce) sweetened condensed milk

1 tablespoon(s) freshly grated lime zest

2 tablespoon(s) fresh lime juice

1.5 tablespoon(s) tequila

1.5 tablespoon(s) Cointreau or other orange-flavor liqueur

4 drop(s) green food color (optional)

2 drop(s) yellow food color (optional)

1.5 cup(s) heavy (whipping) cream

Thin pretzel sticks, for garnish

Lime slice , for garnish